The heart is a hollow muscular organ that pumps blood throughout the body through rhythmic contractions.
The aorta is the largest artery in the body. It originates from the heart and distributes oxygen-rich blood to all organs via its numerous branches.
The right subclavian artery is a major artery that originates from the brachiocephalic trunk. It supplies the right upper limb, as well as parts of the neck and chest.
The left subclavian artery is a large artery that originates directly from the aortic arch. It supplies the left half of the head, neck, and left upper limb.
Arteries are blood vessels that carry oxygenated blood from the heart to the organs and tissues of the body (with the exception of the pulmonary arteries, which carry deoxygenated blood). They branch into smaller arteries, arterioles, and then capillaries to supply cells with oxygen and nutrients. Their walls are elastic and muscular, allowing them to withstand the high pressure of blood pumped by the heart.
Veins are blood vessels that carry deoxygenated blood from the organs and tissues to the heart (with the exception of the pulmonary veins, which carry oxygenated blood from the lungs to the heart). They play a key role in venous return, aided by one-way valves and the contraction of surrounding muscles. Their walls are thinner than those of arteries.
Coronary vessels are the network of blood vessels that supply the heart. They provide the oxygen and nutrients needed for the heart muscle (myocardium) to function.
The iliac arteries are major blood vessels that carry oxygenated blood to the pelvis and lower limbs.
The iliac veins are blood vessels that carry deoxygenated blood from the lower limbs and pelvis to the inferior vena cava.
The colic arteries are branches of the superior and inferior mesenteric arteries, which supply blood to different parts of the colon. They provide the oxygenated blood necessary for the colon to function.
The colic veins drain deoxygenated blood from the colon to the portal venous system to be filtered by the liver. They generally follow the corresponding colic arteries and join together to form tributaries of the superior and inferior mesenteric veins.
The mesenteric veins drain deoxygenated blood from the small intestine and colon to the hepatic portal vein. These veins play a key role in transporting absorbed nutrients to the liver for metabolism.
The mesenteric arteries are branches of the abdominal aorta that supply blood to the digestive organs. These arteries provide oxygenated blood necessary for the proper functioning of the intestines and colon.
The geniculate veins are a venous network located around the knee joint.
The lumbar veins are vessels that drain deoxygenated blood from the muscles and structures of the posterior abdominal wall and lumbar vertebrae. They play an important role in venous return from the lumbar region.
The common hepatic artery is a branch of the celiac artery, which itself originates from the abdominal aorta. It supplies the liver, stomach, and duodenum.
The proper hepatic artery is a branch of the common hepatic artery. It plays an essential role in supplying oxygenated blood to the liver and gallbladder.
The gastroduodenal artery is a branch of the common hepatic artery. It descends behind the duodenum and divides into two branches that supply the greater curvature of the stomach, the greater omentum, the duodenum, and the head of the pancreas.
The splenic vein is a vein that drains deoxygenated blood from the spleen, pancreas, and stomach.
The splenic artery is a branch of the celiac artery. It runs along the upper edge of the pancreas to reach the spleen, which it supplies, as well as the pancreas and stomach.
The renal arteries are branches of the abdominal aorta that supply the kidneys with oxygenated blood. Each kidney is supplied by a renal artery (right and left), which divides into several branches as it enters the kidney to supply the different regions of the kidney, including the cortex and medulla. They play an essential role in blood filtration and maintaining water and electrolyte balance.
The renal veins are blood vessels that drain deoxygenated blood from the kidneys to the inferior vena cava. Each kidney has a renal vein (right and left) that collects blood from the interlobar, segmental, and perinephric veins. They play a crucial role in the elimination of metabolic waste and venous return to the heart.
The celiac trunk is a short branch of the abdominal aorta, located just below the diaphragm. It plays an essential role in supplying blood to the organs of the upper abdominal region.
The left gastric artery supplies the upper part of the stomach (small curvature) and part of the abdominal esophagus. It contributes to the blood supply to these organs by connecting with the right gastric artery to form an anastomosis.
The adrenal vessels include the arteries and veins that supply and drain the adrenal glands, located above the kidneys. These vessels are essential for supplying the adrenal glands and transporting the hormones they produce.
The geniculate veins are a venous network located around the knee joint.
The deep dorsal vein of the penis is a vessel located under the deep fascia, along the dorsal surface of the penis. It drains deoxygenated blood from the erectile tissues, mainly the corpora cavernosa, to the prostatic venous plexus, thus participating in venous return after erection.
The dorsal artery of the penis is a branch of the internal pudendal artery. It runs along the dorsal surface of the penis, above the corpora cavernosa, and supplies blood to the superficial tissues of the penis, including the skin and glans. It plays an important role in the vascularization necessary for erectile function and tissue health.
The deep artery of the penis, also called the cavernous artery, is a branch of the internal pudendal artery. It enters the corpora cavernosa and supplies them with blood, allowing them to fill with blood during erection. It plays a key role in the erectile mechanism by promoting the dilation of the vascular spaces in the erectile tissues.
The internal pudendal vein is a vessel that drains deoxygenated blood from the external genital organs and the perineum. It accompanies the internal pudendal artery and empties into the internal iliac vein. It plays a crucial role in venous return from the perineal region and erectile tissues.
The external pudendal veins are venous vessels that drain deoxygenated blood from the external genital organs (such as the scrotum and labia majora) and the skin of the perineum.
The superficial epigastric vein is a vein located in the anterior abdominal region. It drains blood from the skin and subcutaneous tissues of the lower abdomen.
The basilic vein is a superficial vein of the upper limb, located on the medial (inner) side of the arm. It drains deoxygenated blood from the superficial parts of the forearm and arm, participating in venous return to the heart.
The superficial epigastric artery is a small branch of the femoral artery. It passes through the cribriform fascia and travels toward the anterior abdominal wall, under the skin. It plays a role in supplying blood to the superficial layers of the abdominal wall.
The patellar anastomosis (or peri-patellar anastomotic network) is a vascular network formed around the patella (kneecap). It connects the branches of the main arteries of the knee. It ensures continuous and effective vascularization of the peri-patellar region and the knee, even in the event of movement or partial obstruction of a main artery.
The perforating femoral vessels are branches of the deep femoral artery and vein. These vessels play a key role in the blood supply to and return from the deep muscles of the thigh, which are essential for locomotor activities.
The testicular vessels include the arteries and veins that supply and drain the testicles. These vessels are essential for maintaining the reproductive and hormonal function of the testicles.
The internal jugular vein is a deep vein located in the neck. It collects deoxygenated blood from the brain, face, and neck and transports it to the subclavian vein.
The external jugular vein is a superficial vein located on the side of the neck. It drains blood from the superficial regions of the head and neck, including the scalp and face, and transports it to the subclavian vein.
The subclavian vein is a vein located under the collarbone. It collects deoxygenated blood from the arms, neck, and head and directs it to the brachiocephalic vein.
The superior vena cava is a large vein that carries deoxygenated blood from the head, neck, upper limbs, and thorax to the right atrium of the heart.
The inferior vena cava is a large vein that carries deoxygenated blood from the lower parts of the body (abdomen, pelvis, and lower limbs) to the right atrium of the heart.
The hepatic portal vein is a blood vessel that carries nutrient-rich but oxygen-poor blood from the digestive organs (intestines, stomach, pancreas, spleen) to the liver. It plays a key role in metabolism and detoxification.
The pulmonary arteries are the two branches of the main pulmonary artery. They carry deoxygenated blood from the right ventricle of the heart to the lungs, where it will be oxygenated in the capillaries of the alveoli.
The pulmonary veins are vessels that carry oxygenated blood from the lungs to the left atrium of the heart. There are two per lung.
The common carotid artery is a large vessel located on each side of the neck. It carries oxygenated blood from the heart to the head.
The internal carotid artery is a branch of the common carotid artery. Located in the neck, it carries oxygenated blood directly to the brain and deep structures of the head, playing an essential role in cerebral blood supply.
The external carotid artery is a branch of the common carotid artery. It supplies oxygenated blood to the superficial structures of the head, such as the face, scalp, tongue, and salivary glands.
Lymphatic vessels are ducts that carry lymph, a clear fluid containing white blood cells. They participate in immune defense and drain excess fluid from tissues into the circulatory system.
The thoracic duct is the main lymphatic duct in the body. It drains lymph from most of the body and empties it into the bloodstream via the junction of the left internal jugular vein and the left subclavian vein.
The cisterna chylosa, or Pecquet's cistern, is an enlarged structure located at the base of the thoracic duct, in front of the first lumbar vertebrae. It collects lymph from the lower limbs and abdominal organs before passing it on to the thoracic duct.
The tonsils (or tonsils) are lymphoid tissues located at the back of the oral cavity. They play a role in the immune system by capturing and neutralizing inhaled or ingested pathogens.
Lymph nodes are small bean-shaped structures located along the lymphatic vessels. They filter lymph, remove pathogens, and activate immune responses by producing white blood cells.
The spleen is a lymphoid organ located in the abdomen, to the left of the stomach. It filters the blood, removes old blood cells, stores red blood cells, and plays a role in immunity.
The thymus is a lymphoid organ located behind the sternum, which is most active during childhood. It participates in the maturation of T lymphocytes, which are essential for the immune system.
The kidneys filter the blood to remove waste, regulate water balance, and produce hormones such as erythropoietin.
The ureters are two tubes that carry urine from the kidneys to the bladder. They ensure this transfer through regular muscle contractions.
The renal pelvis (or renal calyx) is a funnel-shaped structure located in the kidney that collects urine produced by the renal calyces before transporting it to the ureter.
The urethra is a tube that carries urine from the bladder to the outside of the body.
The bladder is a hollow organ that stores urine produced by the kidneys before it is expelled through the urethra.
The pancreas is a gland located behind the stomach. It produces enzymes for digestion and hormones, such as insulin, to regulate blood sugar levels.
The thyroid is a butterfly-shaped endocrine gland located at the base of the neck, in front of the trachea. It produces hormones (T3, T4) that regulate metabolism, growth, development, and body temperature, as well as calcitonin, which helps regulate calcium levels.
The adrenal glands are two small endocrine glands located above each kidney. They produce essential hormones such as cortisol and adrenaline (in the adrenal medulla) to manage stress, and aldosterone (in the adrenal cortex) to regulate water and electrolyte balance.
The spleen is a lymphoid organ located in the abdomen, to the left of the stomach. It filters the blood, removes old blood cells, stores red blood cells and platelets, and plays a role in immunity by producing lymphocytes.
The thymus is a lymphoid organ located behind the sternum, which is most active during childhood. It plays a key role in immunity by participating in the maturation of T lymphocytes, which are essential for the body's defense against infection.
The liver is a vital organ located in the abdomen, below the diaphragm. It filters the blood, stores carbohydrates, produces bile for the digestion of fats, and eliminates toxins.
The stomach is a hollow organ located between the esophagus and the small intestine. The gastric juice it contains helps digest food.
The colon is part of the large intestine, which absorbs water and salts from food waste. It forms and transports stool to the rectum for elimination.
The rectum is the terminal part of the large intestine. It stores feces before they are evacuated through the anus during defecation.
The external anal sphincter is a voluntary striated muscle surrounding the anus. It controls the opening and closing of the anal orifice, playing a key role in fecal continence.
The ileocecal appendix, or vermiform appendix, is a small tubular structure attached to the cecum, near the small intestine. It plays a minor role in immunity and can become infected, causing appendicitis.
The small intestine is a long tube located between the stomach and the colon. It digests food and absorbs nutrients, allowing them to pass into the bloodstream.
The esophagus is a muscular tube connecting the throat to the stomach. It transports food and liquids through peristaltic contractions.
The gallbladder is a small organ located under the liver. It stores bile, a liquid produced by the liver, and releases it into the duodenum to aid in the digestion of fats.
Heart valves are structures in the heart that ensure the unidirectional flow of blood.
The sternum is a flat bone located in the center of the chest, connecting the ribs through cartilage, and playing a key role in protecting the heart and lungs.
The xiphoid process is the lower, cartilaginous part of the sternum, which can calcify with age. It serves as an attachment point for several muscles, such as the diaphragm and abdominal muscles, and plays a role in breathing and the stability of the chest wall.
The intervertebral symphysis is a cartilaginous joint located between the vertebral bodies. It is composed of an intervertebral disc, formed by a fibrous ring and a pulpy nucleus, which provides flexibility, shock absorption, and stability to the spine.
The intercornual ligament contributes to the stability of the spine by limiting excessive movement between the vertebrae, while allowing some flexibility in the movements of the spine.
A ligament is a fibrous band of connective tissue that connects bones to each other at the joints. It stabilizes the joints, limits excessive movement, and protects against injury.
The elbow joint capsule is a fibrous envelope that surrounds the elbow joint. It holds the bones (humerus, radius, and ulna) in place, protects the joint, and contains synovial fluid to lubricate and facilitate movement.
The glenohumeral joint capsule is a fibrous envelope that surrounds the shoulder joint. It stabilizes the joint while allowing a wide range of motion and contains synovial fluid to reduce friction.
The intervertebral disc is a fibro-cartilaginous structure located between two vertebrae. It is composed of an outer fibrous ring, which provides stability, and an inner pulpous core, which acts as a shock absorber, allowing flexibility and shock absorption in the spine.
The costal cartilages are cartilaginous structures that connect the ribs to the sternum. They allow flexibility and elasticity of the rib cage, facilitating respiratory movements while providing support for the protection of the thoracic organs.
Cartilage is a flexible and resilient connective tissue found in various parts of the body. It cushions shocks and facilitates joint movement by reducing friction.
The thyroid cartilage is the largest cartilage in the larynx, located at the front of the neck. It forms the Adam's apple and protects the vocal cords, playing a key role in phonation and breathing.
The hyoid bone is a small, horseshoe-shaped bone located in the neck, between the jaw and the larynx. It supports the tongue, serves as an attachment point for several muscles, and plays a role in swallowing and phonation.
The clavicle is a long, thin bone located between the sternum and the shoulder blade. It plays a key role in stabilizing the shoulder and moving the arm.
The corpora cavernosa are two elongated spongy structures that fill with blood during erection.
The corpus spongiosum is a cylindrical structure located beneath the corpora cavernosa. It surrounds the urethra and forms the glans at its tip.
The testicles are glands responsible for producing sperm and testosterone, the male sex hormone.
The epididymis is a coiled tube located behind each testicle, where sperm mature and are stored before passing into the vas deferens (sperm duct).
The glans is the enlarged, sensitive tip of the penis, partially or completely covered by the foreskin. It plays an important role in sexual stimulation.
The linea alba is a band of fibrous tissue located in the center of the abdominal wall, connecting the rectus abdominis muscles.
The flexor tendon sheath is a protective structure surrounding the flexor tendons of the fingers.
The iliotibial tract is a thick fibrous band connecting the ilium to the tibia, stabilizing the hip and knee during walking.
The Achilles tendon is a powerful tendon connecting the calf muscles (gastrocnemius and soleus) to the heel (calcaneus).
The epicranial fascia is a fibrous membrane that connects the frontal and occipital muscles of the skull.
The platysma is a thin, superficial muscle of the neck, extending from the jaw to the collarbone. It is involved in facial expressions, such as lowering the lower lip, and slightly tightens the skin of the neck.
The serratus anterior muscle is a broad, flat muscle located on the lateral wall of the thorax. It stabilizes the scapula against the rib cage and allows movements such as elevation and rotation of the shoulder blade, which are essential for raising the arm above the head.
The masseter is a powerful jaw muscle located on the lateral side of the face. It plays an essential role in chewing by allowing the mandible to rise to close the mouth.
The zygomatic muscles (large and small) are located on the lateral side of the face, between the zygomatic bone and the lips. They raise the corners of the mouth, playing a key role in facial expressions such as smiling.
The risorius muscle is a thin muscle located on the sides of the face. It pulls the corners of the mouth sideways, contributing to facial expressions such as smiling.
The nasal muscle is a facial muscle that covers the bridge of the nose. This muscle helps modulate the movements of the nose and the opening of the nostrils, influencing facial expression and breathing.
The scalene muscles are a group of three muscles located on each side of the neck. They are involved in lateral tilting and flexion of the neck, and when contracted bilaterally, they raise the first ribs, playing an accessory role in breathing.
The levator scapulae muscle is a muscle of the neck and back, located between the cervical vertebrae and the shoulder blade. It raises the shoulder blade, participates in its medial inclination, and contributes to the stabilization of the shoulder.
The latissimus dorsi muscle, or latissimus dorsi, is a large, flat muscle located in the lower back. It participates in the adduction, extension, and internal rotation of the arm, playing a key role in the movements of the trunk and upper limbs.
The iliocostal muscle is a muscle of the back that is divided into three parts (lumbar, thoracic, and cervical) and contributes to the extension, lateral flexion, and stabilization of the spine.
The longissimus thoracis muscle is a deep back muscle. It extends from the lumbar vertebrae to the thoracic vertebrae and ribs, and is involved in the extension, lateral flexion, and stabilization of the spine.
The frontal muscle is a flat muscle located on the forehead. It raises the eyebrows, wrinkles the forehead, and contributes to facial expressions such as surprise.
The deltoid muscles are triangular muscles covering the shoulder. They allow abduction, flexion, extension, and rotation of the arm, playing a key role in shoulder movements.
The sternocleidomastoid muscle is a long, powerful muscle in the neck that connects the sternum, clavicle, and skull (mastoid process). It allows the head to turn and tilt, as well as flex forward.
The splenius capitis muscle is a muscle located at the back of the neck. It allows the head to extend, tilt, and rotate, playing a role in posture and head movements.
The temporalis muscle is a thin, accessory muscle of the skull, located near the temporal region. It is involved in scalp movements and contributes slightly to facial expressions.
The occipital muscle, or occipitalis, is a flat muscle located at the back of the skull. It pulls the scalp backward, often in coordination with the frontal muscle, participating in scalp movements and facial expressions.
The temporal muscle is a large, fan-shaped muscle located on the sides of the skull. It plays an essential role in chewing, allowing the jaw to close by raising and retracting the mandible.
The gastrocnemius muscles (also called the twin muscles) are muscles in the calf. They contribute to plantar flexion (or extension of the foot, as when standing on tiptoes) and knee flexion, playing a key role in walking and running.
The soleus muscle is a deep muscle in the calf, located below the gastrocnemius. It is mainly involved in plantar flexion of the foot, playing an essential role in posture and walking by supporting the body's weight.
The rectus femoris muscle is a long, powerful muscle in the thigh, belonging to the quadriceps. It is involved in knee extension and hip flexion, playing an important role in walking, running, and jumping.
The sartorius muscle is a long, thin muscle in the thigh, extending from the iliac bone to the tibia. It allows flexion, abduction, and external rotation of the hip, as well as flexion of the knee.
The iliacus muscle is a flat, triangular muscle located in the inner iliac fossa of the pelvis. Together with the psoas muscle, it participates in hip flexion and external rotation of the thigh. Together, they form the iliopsoas muscle.
The tensor fascia lata muscle is a lateral muscle of the thigh that stabilizes the hip and knee and assists in abduction, flexion, and medial rotation of the hip.
The tensor fascia lata muscle is a lateral muscle of the thigh that stabilizes the hip and knee and assists in abduction, flexion, and medial rotation of the hip.
The vastus medialis muscle is a muscle in the thigh, located on its inner side, which contributes to knee extension and stabilization of the patella.
The gracilis muscle is a long, thin muscle in the thigh, located on its medial side, which participates in adduction of the thigh and flexion of the knee.
Muscles are contractile structures in the human body, made up of muscle fibers, which enable movement, posture, and the maintenance of vital functions.
The medial patellar retinaculum is a fibrous band located on the inner side of the knee, connecting the patella (kneecap) to the medial condyle of the femur, contributing to the medial stability of the patella.
The vastus lateralis muscle is a muscle in the thigh, located on its outer side, which participates in knee extension.
The tibialis anterior muscle is a muscle located at the front of the leg. It allows dorsiflexion (raising the foot toward the leg) and inversion of the foot, playing a key role in walking and running.
The posterior tibial muscle is a deep muscle in the leg, located at the back. It plays a crucial role in plantar flexion (pointing the foot toward the ground) and inversion of the foot, contributing to the stability of the ankle and arch of the foot.
The trapezius muscles are large triangular muscles located in the upper back and neck. They enable movements of the shoulder blades, such as elevation, retraction, and rotation, and help stabilize the head.
The orbicularis oris muscle is a circular muscle surrounding the mouth. It allows movements such as closing the lips, whistling, or speaking, playing a key role in facial expression.
The orbicularis oculi muscle is a circular muscle surrounding the eyelids. It allows the eyes to close.
The cornea is a transparent membrane located at the front of the eye. It protects the eye and helps focus light on the retina.
The lacrimal gland is a gland located in the upper outer part of the eye socket. It produces tears.
The nasolacrimal duct is a passageway between the eye and the nasal cavity. It drains tears from the lacrimal sac, located near the inner corner of the eye, into the nasal cavity.
The retina is a thin layer of nerve tissue located at the back of the eye. It captures light using photoreceptors (rods and cones) and converts these signals into nerve signals that are transmitted to the brain via the optic nerve.
The iris is the colored part of the eye, located between the cornea and the lens. It regulates the amount of light entering the eye by controlling the opening and closing of the pupil.
The lens is a transparent lens located behind the iris in the eye. It focuses light on the retina by adjusting its curvature to allow clear vision at different distances.
The ciliary bodies are structures located in the eye, between the iris and the choroid. They produce the aqueous humor and contain the ciliary muscles, which change the shape of the lens for visual accommodation.
The optic chiasm is a structure located at the base of the brain where the fibers of the optic nerves partially cross each other. It enables visual processing by transferring information from the left and right visual fields to the opposite cerebral hemispheres.
The optic tract is a bundle of nerve fibers that extends from the optic chiasm. It carries visual information from the optic nerves to the visual centers of the brain, including the thalamus and the visual cortex.
The sclera, or white of the eye, is a rigid, opaque membrane that forms the outer wall of the eye.
The cochlea is a spiral-shaped structure containing sensory hair cells that convert sound vibrations into nerve signals.
The ossicles transmit and amplify sound vibrations from the eardrum to the inner ear.
The eardrum is a thin membrane that vibrates under the effect of sound waves, transmitting these vibrations to the ossicles.
The vestibule is a part of the inner ear that plays a key role in balance by detecting head movements and body position.
The thalamus is a structure in the brain that acts as a relay for sensory information (except smell), transmitting it to the cerebral cortex.
The corpus callosum is a large band of nerve fibers that connects the two hemispheres of the brain, allowing communication between them.
The cerebellum is part of the brain. It controls movement coordination, balance, and posture.
The flocculus is a small structure in the cerebellum, located on its underside. It plays a key role in maintaining balance and coordinating eye movements by receiving and integrating vestibular information.
The cerebellar tentorium is a fibrous membrane that separates the brain from the cerebellum.
The falx cerebri is a structure of the dura mater in the form of a vertical blade, located in the longitudinal fissure between the two cerebral hemispheres. It stabilizes the brain within the skull and contains the superior and inferior sagittal sinuses, contributing to venous drainage.
The midbrain is part of the brainstem. It relays nerve messages between the brain and the brainstem and also participates (among other things) in the control of movement, vision, hearing, and certain reflex responses.
The ventral tegmental area (VTA) is a region of the midbrain. It contains dopaminergic neurons that play a key role in the reward system, motivation, and pleasure. It is also involved in learning and addiction mechanisms.
 
The spinal ganglion (or spinal ganglion) is a bulge located on the posterior root of the spinal nerves. It contains the cell bodies of sensory neurons, which transmit information from the body's sensory receptors to the spinal cord.
The ventral root of the spinal nerve is a structure located at the front of the spinal cord. It contains efferent motor nerve fibers that primarily transmit motor nerve messages.
The dorsal root of the spinal nerve is a nerve structure located at the back of the spinal cord. It contains afferent sensory nerve fibers, which transmit nerve messages from the body's sensory receptors to the central nervous system.
The sympathetic trunk is a chain of nerve ganglia located on either side of the spine. It is part of the sympathetic autonomic nervous system, which regulates involuntary functions such as heart rate, pupil dilation, vasoconstriction, and stress.
The pons, or protuberance, is part of the brain stem. It acts as a relay for nerve messages between the brain and the cerebellum and helps regulate breathing and motor functions.
The white matter of the brain is composed of myelinated nerve fibers that ensure rapid transmission of signals between different regions of the brain and the spinal cord.
The cerebrum is part of the brain. It consists of two cerebral hemispheres that control cognitive (thinking, memory, etc.), sensory, and motor functions.
The putamen is a structure in the basal ganglia of the brain. It plays an essential role in the control of voluntary movements, motor learning, and certain cognitive functions.
The globus pallidus is a structure of the basal ganglia located in the brain. It participates in the control of voluntary movements by modulating the activity of motor circuits, in conjunction with the thalamus and the cerebral cortex.
The choroid plexus is a structure located in the ventricles of the brain. It produces cerebrospinal fluid, which protects the central nervous system, transports nutrients, and removes waste.
The hippocampal commissure is a bundle of nerve fibers connecting the two hippocampi, located in the cerebral hemispheres. It facilitates communication between these structures involved in memory and spatial navigation.
The fornix is a bundle of nerve fibers in the shape of an arch, connecting the hippocampus to deep structures of the brain, such as the mammillary bodies. It plays a key role in memory and the limbic system.
The septum pellucidum is a thin membrane located between the lateral ventricles of the brain. It separates these ventricles and helps support the surrounding brain structures.
The hippocampus is a loop-shaped structure in the temporal lobe. It plays a central role in memory, learning, and spatial orientation.
The epiphysis, or pineal gland, is a small structure located in the center of the brain. It regulates biological rhythms, such as sleep, by secreting melatonin.
The stria terminalis is a bundle of nerve fibers connecting the amygdala to the hypothalamus and other brain structures. It is involved in regulating emotions and stress responses.
The medullary stria is a bundle of nerve fibers located in the brain. It connects structures of the limbic system, such as the amygdala and the habenula, and is involved in regulating emotions and behavior.
The habenula is a small structure located above the thalamus. It plays a role in modulating emotions, motivation, and behavior, particularly in response to rewards and punishments.
The amygdala is an almond-shaped structure located in the temporal lobe of the brain. It plays a key role in emotions, including fear and anxiety, as well as in the formation of emotional memories.
The cerebral ventricles are cavities filled with cerebrospinal fluid that provide protection, nutrition, and waste removal for the central nervous system.
The internal capsule is a structure of white matter located in the brain, between the basal ganglia. It contains nerve fibers that connect the cerebral cortex to other parts of the nervous system.
The caudate nucleus is a structure of the basal ganglia of the brain. It is involved in the regulation of movement, learning, memory, and certain cognitive functions.
The medulla oblongata, or bulbar pons, is part of the brain stem. It controls vital functions such as breathing, heart rate, and blood pressure, while also serving as a relay between the brain and the spinal cord.
The spinal cord is part of the central nervous system. It is protected by the spine. It transmits nerve messages between the brain and the rest of the body and controls certain reflexes.
The pituitary gland is a small gland located at the base of the brain, below the hypothalamus. It regulates many bodily functions by producing hormones.
The hypothalamus is a small structure located at the base of the brain, below the thalamus. It regulates vital functions such as body temperature, reproduction, thirst, hunger, and stress, and controls the endocrine system via the pituitary gland.
The sciatic nerve, the longest nerve in the body, starts at the lower back and innervates the leg, controlling its sensitivity and movement.
The brachial plexus is a network of nerves formed by the roots of the spinal nerves (rachidian) C5 to T1. It innervates the upper limbs.
The femoral nerve innervates the muscles of the anterior region of the thigh (particularly the quadriceps) for knee extension and hip flexion, as well as the skin of the anterior and medial aspects of the thigh.
The ulnar nerve crosses the arm, forearm, and Guyon's canal to innervate certain muscles of the hand and provide sensation to the medial edge of the hand, including the little finger and part of the ring finger.
The radial nerve innervates the posterior muscles of the arm and forearm, responsible for elbow, wrist, and finger extension, and provides sensation to the posterior surface of the arm, forearm, and hand.
The musculocutaneous nerve innervates the muscles of the anterior compartment of the arm (biceps brachii, brachialis, coracobrachialis) for elbow flexion and supination, and provides sensation to the lateral aspect of the forearm.
The lateral superior cutaneous nerve of the arm is purely sensory. It innervates the skin of the upper and lateral part of the arm, providing skin sensitivity in this region.
The lateral superior cutaneous nerve of the arm is purely sensory. It innervates the skin of the upper and lateral part of the arm, providing skin sensitivity in this region.
The median nerve crosses the arm, forearm, and carpal tunnel to innervate the muscles of the hand and provide sensation to the palm and the first three fingers, playing a key role in fine grasping.
The intercostal nerves are spinal nerves that originate from the thoracic roots of the spinal cord. They innervate the intercostal muscles and the skin of the chest and abdominal wall, participating in respiration and skin sensitivity.
The iliohypogastric nerve is a mixed nerve originating from the lumbar plexus. It innervates the muscles of the abdominal wall and provides sensitivity to the hip and hypogastric region (lower abdomen).
The lateral pectoral nerve innervates the pectoralis major muscle, contributing to its motor functions, such as adduction and internal rotation of the arm.
The posterior femoral cutaneous nerve innervates the skin of the posterior thigh, the gluteal fold, and sometimes part of the posterior leg, transmitting sensations from these regions.
Nerves are structures of the peripheral nervous system composed of nerve fibers. They transmit information between the central nervous system (brain and spinal cord) and the rest of the body.
The olfactory nerve is a purely sensory cranial nerve responsible for smell. It transmits signals from the olfactory receptors located in the nasal mucosa to the brain, enabling the perception of odors.
The optic nerve is a cranial nerve that transmits visual information from the retina to the brain.
The oculomotor nerve is a cranial nerve that controls most of the movements of the eye muscles (elevation, adduction, depression), the opening of the eyelid (levator palpebrae muscle), and pupil constriction (via the sphincter muscle of the iris).
The trochlear nerve is a motor cranial nerve. It innervates the superior oblique muscle of the eye, allowing it to rotate inward and move downward and outward. It is the only cranial nerve that emerges from the back of the brain stem.
The trigeminal nerve is a mixed cranial nerve responsible for facial sensation and motor functions related to chewing.
The abducens nerve is a motor cranial nerve. It controls the lateral rectus muscle of the eye, allowing the eye to move outward (abduction).
The facial nerve is a mixed cranial nerve. It controls the muscles of facial expression, allows taste in the anterior two-thirds of the tongue, and innervates the lacrimal and salivary glands.
The vestibulocochlear nerve is a sensory cranial nerve. It divides into two branches: the cochlear branch, for hearing, and the vestibular branch, for balance and coordination of movement.
The glossopharyngeal nerve is a mixed cranial nerve. It is involved in taste and sensation in the posterior third of the tongue, controls swallowing, and regulates salivation and blood pressure via the carotid sinus.
The vagus nerve is a mixed cranial nerve. It controls the autonomic functions of the thoracic and abdominal organs, is involved in swallowing and phonation, and transmits sensory information from the pharynx, larynx, and viscera.
The accessory nerve is a motor cranial nerve. It innervates the sternocleidomastoid and trapezius muscles, enabling movement of the head, neck, and shoulders.
The inferior laryngeal nerve, which branches off from the vagus nerve (X), innervates certain muscles of the larynx and provides some of the sensitivity of the subglottic laryngeal mucosa. It plays a key role in phonation and respiration.
The posterior roots of the spinal nerves are nerve structures located at the back of the spinal cord. They carry sensory information from the body (such as touch, pain, and temperature) to the central nervous system.
The anterior roots of the spinal nerves are nerve structures located at the front of the spinal cord. They carry motor signals from the central nervous system to the muscles, allowing them to contract.
The cauda equina is a bundle of nerves located at the lower end of the spinal cord, in the spine. It innervates the lower limbs and the pelvic region.
The interspinous ligament is a ligament located between the spinous processes of adjacent vertebrae. It contributes to the stability of the spine, limiting excessive flexion and protecting the vertebral structures.
The intertransverse ligament is a ligament located between the transverse processes of adjacent vertebrae. It contributes to the stability of the spine by limiting excessive lateral bending.
The supraspinous ligament (or supraspinal ligament) is a longitudinal ligament that connects the tips of the spinous processes of the vertebrae, from the cervical region to the sacral region. It contributes to the stability of the spine and limits excessive flexion of the back.
The yellow ligament is an elastic ligament connecting the laminae of adjacent vertebrae along the entire length of the spine. It helps maintain posture, allows flexion and extension of the spine, and protects the spinal cord.
The interosseous membrane of the forearm is a thin fibrous structure connecting the radius and ulna along their entire length. It stabilizes the two bones, serves as an attachment point for certain muscles, and helps transmit force between the wrist and elbow.
The wrist joint capsule is a fibrous envelope that surrounds the radiocarpal joint. It protects the joint, holds the bones in place, and contains synovial fluid that lubricates the joint surfaces to facilitate movement.
The epiglottis is a tongue-shaped piece of cartilage located at the entrance to the larynx. It folds down during swallowing to prevent food and liquids from entering the respiratory tract.
The patella, or kneecap, is a flat bone located at the front of the knee. It protects the joint and improves the efficiency of the quadriceps muscles.
The vertebrae are bones that form the spine. They protect the spinal cord, support the body, and allow movements such as flexion, extension, and rotation. They are classified into five regions: cervical, thoracic, lumbar, sacral, and coccygeal.
The clitoris is a sensitive organ located at the upper junction of the labia minora. It plays a central role in sexual pleasure thanks to its numerous nerve endings.
The prostate is a gland in the male reproductive system, located below the bladder. It produces a fluid that nourishes and transports sperm in semen.
The sperm duct, or vas deferens, is a duct in the male reproductive system that carries sperm from the epididymis to the urethra during ejaculation.
The uterus is a hollow organ that houses the embryo, allows it to develop during pregnancy, and expels the fetus during childbirth.
The ovaries are two glands located on either side of the uterus. They produce eggs and female sex hormones, such as estrogen and progesterone.
The fallopian tubes are two tubes that connect the ovaries to the uterus. They transport the egg and are the usual site of fertilization.
The vagina is a muscular, elastic canal connecting the vulva to the uterus. It allows sexual intercourse, menstrual flow, and serves as a passageway during childbirth.
The vulva is the external female genitalia, including the labia, clitoris, vaginal opening, and associated glands. It plays a role in sexual pleasure.
The Cowper's glands (bulbourethral glands) are located on either side of the male urethra. They secrete a fluid that lubricates the urethra and neutralizes its acidity before ejaculation.
The seminal vesicles are two glands located behind the prostate, producing a fructose-rich fluid that nourishes the sperm and constitutes a large part of the semen.
The sublingual gland is a salivary gland located under the tongue, in the floor of the mouth.
The submandibular gland is a salivary gland located under the lower jaw.
The parotid glands are the largest salivary glands, located on either side of the face, near the ears.
The tibia is the bone in the leg that supports the weight of the body and is involved in walking movements.
The fibula is a long, thin bone in the leg, located on the outside of the tibia. It supports the ankle, stabilizes the joint, and serves as an attachment point for several muscles, although it does not directly support the body's weight.
The coccyx is a small triangular bone located at the lower end of the spine. A remnant of an ancestral tail, it plays a role in stabilizing the sitting position and serves as an attachment point for the muscles and ligaments of the pelvis.
The sacrum is a triangular bone located at the base of the spine, between the two iliac bones of the pelvis. It transmits the body's weight to the lower limbs.
The ribs are long, curved bones that form the rib cage. They protect vital organs such as the heart and lungs and participate in respiratory movements by rising and falling.
The pubis is part of the iliac bone, located at the front of the pelvis. It forms the anterior region of the pelvic ring, supports the abdominal organs, and serves as an attachment point for muscles.
The scapula, or shoulder blade, is a flat, triangular bone located in the upper back. It connects the arm to the thorax, serves as an attachment point for several muscles, and participates in shoulder movements.
The humerus is the long bone of the arm, connecting the shoulder to the elbow. It supports the muscles and forms joints that allow movement of the arm and forearm.
The femur is the longest and strongest bone in the human body. Located in the thigh, it connects the hip to the knee and supports the body's weight when walking, running, and standing.
The skull is a bony structure that protects the brain and houses the sensory organs. It is composed of several bones, grouped into two parts: the cranium and the facial skeleton.
Teeth are hard structures located in the oral cavity. They enable food to be chewed for easier digestion, play a role in speech, and contribute to the aesthetics of the face.
Red bone marrow is a spongy tissue found in flat bones and the ends of long bones. It is responsible for producing blood cells: red blood cells, white blood cells, and platelets, in a process called hematopoiesis.
The cephalic vein is a superficial vein located on the side of the arm. It drains blood from the superficial tissues of the hand, forearm, and arm, and empties into the axillary vein at the shoulder.
The femoral artery is a large artery located in the thigh. It carries oxygenated blood from the heart to the lower limbs, supplying the muscles and surrounding tissues.
The femoral vein is a deep vein located in the thigh. It drains deoxygenated blood from the lower limbs and carries it to the external iliac vein.
The great saphenous vein is the longest superficial vein in the body, located on the medial side of the leg and thigh. It drains blood from the superficial tissues of the lower limbs and empties into the femoral vein.
The inferior saphenous vein, also known as the small saphenous vein, is a superficial vein located at the back of the leg. It drains blood from the superficial tissues of the foot and leg and empties into the popliteal vein at the knee.
The popliteal artery is a continuation of the femoral artery, located at the back of the knee. It supplies oxygenated blood to the structures of the knee, leg, and foot, and divides into the anterior and posterior tibial arteries.
The alar cartilage is a flexible structure located in the wings of the nose. It maintains their shape, ensures their flexibility, and participates in the movements necessary for breathing.
The external intercostal membrane is a thin fibrous structure located between the ribs, continuing the external intercostal muscles. It contributes to the stability of the rib cage and participates in respiratory movements by facilitating the expansion of the thorax.
The intercostal membrane is a thin fibrous structure located between the ribs, continuing the intercostal muscles. It contributes to the stability of the rib cage and participates in respiratory movements by facilitating the expansion of the thorax.
The anterior longitudinal ligament is a fibrous band located at the front of the vertebral bodies, extending from the base of the skull to the sacrum. It stabilizes the spine and limits excessive extension of the back.
The ilium is a flat, broad bone forming the upper part of the pelvis. It supports the abdominal organs and serves as an attachment point for the muscles of the legs and trunk.
The scapula, or shoulder blade, is a flat, triangular bone located in the upper back. It connects the arm to the thorax and facilitates shoulder movement.
The pectoralis major is a large, powerful muscle in the chest, connecting the clavicle, sternum, and ribs to the humerus. It is involved in arm movement.
The external oblique muscle of the abdomen is a large, superficial muscle located on the sides of the abdomen. It is involved in flexion, rotation of the trunk, and maintaining posture.
The gluteus maximus is a large muscle in the buttocks, responsible in particular for maintaining posture when walking or standing.
The inguinal ligament is a fibrous band stretched between the anterior superior iliac spine and the pubis. It serves as an attachment point for several muscles and delimits the groin region, playing a role in the stability of the abdominal wall.
The peroneus longus is a muscle in the leg, located on its lateral side. It allows eversion (external rotation) and plantar flexion of the foot, contributing to the stability of the ankle and arch of the foot.
The semitendinosus is a muscle located at the back of the thigh, part of the hamstrings. It allows hip extension, knee flexion, and contributes to internal rotation of the leg.
The biceps brachii is a muscle located in the arm. It allows elbow flexion, supination of the forearm, and participates in shoulder flexion.
The triceps brachii is a muscle located at the back of the arm, composed of three heads (long, lateral, and medial). It allows elbow extension and participates in shoulder extension and adduction.
The brachioradialis muscle is a muscle in the forearm. It allows the elbow to flex and contributes to the stability of the elbow joint.
The brachialis muscle is a deep muscle located under the biceps brachii, at the front of the arm. It is primarily responsible for flexing the elbow, regardless of the angle of the forearm.
The cavernous sinus is a venous cavity located on either side of the sella turcica, at the base of the skull. It drains venous blood from the brain.
The basilar venous plexus is a network of veins located at the base of the skull. It connects the cerebral venous sinuses and participates in the venous drainage of the brain.
The lungs, located in the rib cage, enable breathing by exchanging oxygen and carbon dioxide between the air and the blood.
The trachea is a respiratory passage located between the larynx and the bronchi. It transports air to the lungs and is reinforced by cartilaginous rings to keep it open.
The bronchi are respiratory passages that extend from the trachea and branch out into the lungs. They carry air to the alveoli.
The pharynx is a muscular passage located behind the mouth and nose. It serves as a common passageway for air, which travels to the larynx, and food, which is directed to the esophagus.
The epiglottis is a small tongue-shaped cartilage located at the entrance to the larynx. It folds down to prevent food from entering the respiratory tract during swallowing.
The tongue is a muscular organ located in the oral cavity. It plays an essential role in chewing, swallowing, speech, and taste perception thanks to its taste buds.
The nasal cavity, lined with mucous membrane, is a structure located behind the nostrils. It moistens, warms, and filters the air we breathe in thanks to its cilia and mucus-secreting glands, while also playing a role in smell and voice resonance.
