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Lower part of the trunk, beneath the diaphragm, containing the main organs of the digestive, urinary and reproductive systems.

abdominal aorta
Fourth and last section of the aorta, located in the abdomen; it ends with the common iliac arteries.

abducent nerve
Cranial nerve, mainly motor, involved in lateral eye movements.

abductor muscle of great toe
Muscle connecting the calcaneus to the proximal phalanx of the big toe; it allows the big toe to flex and move away from the axis of the foot (abduction).

abductor muscle of little finger
Muscle connecting the pisiform bone to the proximal phalanx of the little finger; it mainly allows the little finger to move away from the axis of the hand (abduction).

abductor muscle of little toe
Muscle connecting the calcaneus to the proximal phalanx of the little toe; it allows the little toe to move away from the axis of the foot (abduction).

accessory cephalic vein
Vein running along the forearm and emptying into the cephalic vein near the elbow.

accessory nerve
Cranial nerve, essentially motor, controlling the movements of the neck and shoulders.

accessory saphenous vein
Vein draining blood from the posterior part of the thigh and emptying it into the great saphenous vein.

Concave articular surface of the iliac bone within which the head of the femur pivots.

acromial branch of thoracoacromial artery
Branch of the thoracoacromial artery, irrigating the deltoid muscle and acromion.

Bony protrusion of the scapula articulating with the clavicle.

adductor muscle of thumb
Deep muscle formed of two heads (oblique and transverse) connecting the capitate bone and second and third metacarpals to the proximal phalanx of the thumb; it allows the thumb to move toward the axis of the hand (adduction).

ampulla of uterine tube
Enlarged portion of the uterine tube, between the infundibulum and isthmus.

anconeus muscle
Muscle connecting the lateral epicondyle of the humerus to the posterior border of the ulna; it reinforces the action of the triceps, allowing extension of the forearm.

angular artery
Branch of the facial artery, irrigating mainly the nose and lower eyelid.

angular vein
Vein running along the region from the internal part of the eye to the root of the nose; it extends via the facial vein.

Joint connecting the foot with the leg.

annular ligaments of trachea
Circular ligaments connecting the tracheal cartilages.

anterior cardiac veins
Small veins of the right ventricle, emptying directly into the right atrium.

anterior cerebral artery
Branch of the internal carotid artery, irrigating the frontal lobe of the brain.

anterior cervical lymph nodes
Nodes of the neck region, consisting of the superficial and deep anterior cervical lymph nodes.

anterior circumflex humeral artery
Branch of the axillary artery, irrigating the shoulder joint, as well as the biceps and deltoid muscles.

anterior circumflex humeral vein
Vein of the anterior part of the shoulder, emptying into the axillary vein.

anterior commissure
Transverse bundle of nerve fibers connecting the two cerebral hemispheres, in front of the third ventricle.

anterior communicating artery
Very short artery connecting the two anterior cerebral arteries.

anterior cruciate ligament
Ligament located inside the articular capsule of the knee and connecting the femur to the tibia; it restrains forward movement of the tibia.

anterior cutaneous branch of iliohypogastric nerve
Branch of the iliohypogastric nerve, innervating the skin of the pubis.

anterior inferior cerebellar artery
Branch of the basilar artery, irrigating the anterior inferior part of the cerebellum.

anterior inferior iliac spine
Bony protrusion of the anterior part of the ilium, located beneath the anterior superior iliac spine.

anterior intercostal arteries
Branches of the internal thoracic artery, irrigating the intercostal spaces.

anterior intercostal veins
Veins running through the intercostal spaces and emptying into the internal thoracic veins.

anterior interosseous artery
Branch of the common interosseous artery, irrigating the anterior part of the forearm.

anterior interosseous veins
Veins of the anterior part of the forearm, emptying into the ulnar veins near the elbow.

anterior jugular vein
Vein carrying blood from the bottom of the face and part of the neck to the external jugular vein.

anterior lateral malleolar artery
Branch of the anterior tibial artery, irrigating the lateral part of the ankle, in front.

anterior ligament of head of fibula
Ligament connecting the tibia and anterior part of the head of the ulna.

anterior longitudinal ligament
Long ligament covering the anterior face of the vertebral column, from the base of the skull to the sacrum.

anterior medial malleolar artery
Branch of the anterior tibial artery, irrigating the medial part of the ankle, in front.

anterior perforated substance
Region at the base of the brain where numerous twigs of the anterior and middle cerebral arteries penetrate into the cerebral hemispheres.

anterior root of spinal nerve
Area where the motor nerve fibers of a spinal nerve attach to the spinal cord.

anterior scalene muscle
Muscle connecting the transverse processes of certain cervical vertebrae (third to sixth) to the first rib; it especially allows the first rib to be lifted.

anterior semilunar cusp of the pulmonary valve
One of three components of the pulmonary valve, assisting in closing the orifice during ventricular systole.

anterior superior iliac spine
Bony protrusion of the anterior part of the ilium.

anterior tibial artery
Terminal branch of the popliteal artery, running along the anterior compartment of the leg and irrigating the extensor muscles.

anterior tibial muscle
Thick muscle connecting the tibia to the medial cuneiform and first metatarsal bones; it allows the foot to flex back and move toward the axis of the body.

anterior tibial recurrent artery
Branch of the anterior tibial artery, irrigating the lateral and anterior parts of the knee; it follows an upward course.

anterior tibial veins
Veins of the anterior side of the leg, joining with the posterior tibial veins to form the popliteal vein.

Protrusion of the pinna, parallel to the helix, whose upper part divides into two branches.

Small triangular eminence at the lower extremity of the antihelix.

aortic valve
Elastic structure preventing reverse flow of the blood of the aorta to the left ventricle.

apex of lung
Upper extremity of the lung.

apex of urinary bladder
Upper part of the bladder.

arch of aorta
Second segment of the aorta, giving rise to three large ascending arteries irrigating the head and upper limbs.

Colored area surrounding the nipple.

Part of the upper limb between the shoulder and elbow, corresponding to the humerus.

articular branches of descending genicular artery
Branches of the descending artery of the knee, irrigating the knee joint.

arytenoid cartilage
Each of two structures articulated with the cricoid cartilage, on which the lower vocal cords insert.

ascending aorta
First segment of the aorta, starting from the left ventricle and giving rise to two coronary arteries, irrigating the heart.

ascending branch of lateral circumflex femoral artery
Branch of the lateral circumflex femoral artery, irrigating the muscles of the upper thigh.

ascending cervical artery
Terminal branch of the thyrocervical trunk, irrigating the muscles of the neck and the medullary canal.

ascending colon
Initial segment of the colon, in the right part of the abdomen.

ascending lumbar vein
Vein parallel to the vertebral column, joining with the subcostal vein to form the azygos vein on the right side and the hemiazygos vein on the left side.

First cervical vertebra (C1), articulating with the skull at the foramen magnum.

atrioventricular septum
Wall separating the right atrium and left atrium of the heart, over a small surface.

Hollow located beneath the shoulder, between the arm and thorax, covered with hair at puberty.

axillary artery
Extension of the subclavian artery, crossing the hollow of the underarm and allowing irrigation of the shoulder and thoracic wall; it continues through the brachial artery.

axillary lymph nodes
Nodes of the armpit region, filtering lymph from the upper limbs and upper external part of the thorax.

axillary nerve
Nerve arising from the brachial plexus, innervating especially the deltoid and teres minor muscles, as well as the skin of the shoulder.

axillary vein
Vein crossing the hollow of the armpit and ending at the subclavian vein; it especially receives the veins of the shoulder and thorax.

Second cervical vertebra (C2), having a vertical process allowing the atlas to pivot and the skull to rotate.

azygos vein
Vein carrying blood from the mediastinal, diaphragmatic, intercostal and lombar regions to the upper vena cava.