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ALPHABETICAL INDEX
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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TERMS AND DEFINITIONS
LINKS TO THE VIRTUAL HUMAN BODY
labium majus
Skin folds bounding the vulva and protecting the vagina opening.

labium minus
Folds of mucous membrane located inside the labia majora.

lacrimal bone
Paired bone forming part of the medial wall of the orbits.

lactiferous duct
Channel carrying milk secreted by the mammary gland to the nipple.

lactiferous sinus
Enlargement of the galactophorous duct in which mother’s milk accumulates between two feedings.

large intestine
Last segment of the digestive tract, consisting of the cecum, colon and rectum, connecting the small intestine to the anus.

laryngopharynx
Lower part of the pharynx, communicating with the larynx and esophagus.

larynx
Muscular cartilaginous channel serving as a transition between the pharynx and trachea and containing the vocal cords.

lateral abdominal cutaneous branch of intercostal nerve
Branch of the intercostal nerve, assisting in innervating the skin of the lateral and posterior parts of the abdomen.

lateral arcuate ligament
Ligament connecting the transverse process of the first lombar vertebra and twelfth rib; it especially serves as a point of insertion for part of the muscle fibers of the diaphragm.

lateral circumflex femoral artery
Branch of the deep artery of the thigh, irrigating the hip and thigh muscles.

lateral circumflex femoral veins
Veins of the thigh, emptying generally into the femoral vein.

lateral condyle of femur
Rounded protrusion of the external part of the lower extremity of the femur, allowing articulation with the tibia.

lateral condyle of tibia
Rounded protrusion of the upper extremity of the tibia, allowing articulation with the femur.

lateral cord
Bundle of nerve fibers of the brachial plexus, giving rise especially to the lateral and musculocutaneous pectoral nerves, as well as half of the median nerve.

lateral cuneiform
Bone of the tarsus, articulating with the navicular bone and third metatarsal.

lateral cutaneous branch of iliohypogastric nerve
Branch of the iliohypogastric nerve, innervating the skin of the buttock region.

lateral cutaneous nerve of thigh
Branch of the lombar plexus, innervating the skin of the lateral part of the thigh.

lateral epicondyle
Outer protrusion of the lower extremity of the humerus, serving to attach various extensor muscles of the hand and fingers.

lateral head of gastrocnemius muscle
Part of the gastrocnemius muscle inserting on the lateral condyle of the femur.

lateral head of triceps of arm
Part of the brachial triceps inserting into the posterior side of the humerus, on the outer side.

lateral inferior genicular artery
Branch of the popliteal artery, irrigating partly the knee region, outside and inside.

lateral intermuscular septum of arm
Membrane of fibrous tissue extending from the lateral border of the humerus to the fascia of the arm.

lateral lamina of pterygoid process
External part of the pterygoid process of the sphenoid bone.

lateral malleolus
Bony protrusion of the outer ankle, formed by the lower epiphysis of the fibula.

lateral meniscus
Semilunar fibrocartilaginous structure located on the outer side of the knee and assisting in its articulation.

lateral nasal artery
Branch of the facial artery, irrigating the hind part of the nose and nasal ala.

lateral pectoral cutaneous branch of intercostal nerve
Branch of the intercostal nerve, assisting in innervating the skin of the lateral and posterior parts of the thorax.

lateral pectoral nerve
Nerve arising from the brachial plexus, innervating the pectoral muscles and part of the shoulder.

lateral plantar artery
Terminal branch of the posterior tibial artery, assisting in forming the deep plantar arch.

lateral sulcus
Sulcus running along the external side of the brain, separating the frontal and temporal lobes.

lateral superior genicular artery
Branch of the popliteal artery, irrigating partly the knee region, inside and above.

lateral tarsal artery
Branch of the dorsal artery of the foot, irrigating the region of the tarsus.

lateral thoracic artery
Branch of the axillary artery, irrigating the pectoral muscles and, in women, the mammary glands.

lateral thoracic vein
Vein collecting blood from the lateral part of the thorax and emptying it into the axillary vein.

latissimus dorsi muscle
Large flat muscle connecting the lombosacral spine to the humerus; it allows the arm to rotate inward and to move toward the axis of the body (adduction).

left atrium
Cavity of the heart, receiving oxygenated blood from the pulmonary veins.

left colic flexure
Curvature formed by the colon between its transverse and descending portions.

left coronary artery
Artery originating in the aorta and irrigating the left side of the myocardium.

left crus of diaphragm
Musculotendinous band securing the diaphragm to the vertebral column; it inserts into the first two lombar vertebrae, to the left of the aorta.

left gastric artery
Branch of the celiac trunk, irrigating the superior inner part of the stomach.

left inferior lobar bronchus
Twig of the main left brochus, leading to the inferior lobe of the left lung.

left inferior pulmonary vein
Vein returning blood oxygenated in the inferior part of the left lung to the left atrium of the heart.

left lobe of liver
Part of the liver located to the left of the falciform ligament.

left lumbar lymph nodes
Abdominal nodes grouped near the abdominal aorta.

left lung
Respiratory organ divided into two lobes, in which blood from the left pulmonary artery is freed of carbon dioxide and enriched with oxygen.

left main bronchus
Bronchus emanating from the trachea, allowing air to enter and exit the left lung.

left pulmonary artery
Branch of the pulmonary trunk, carrying deoxygenated blood to the left lung.

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

left superior lobar bronchus
Twig of the main left brochus, leading to the superior lobe of the left lung.

left superior pulmonary vein
Vein returning blood oxygenated in the superior part of the left lung to the left atrium of the heart.

left suprarenal vein
Vein carrying blood from the left surrenal gland to the left renal vein.

left testicular vein
In men, vein carrying blood from the left testicle to the left renal vein.

left ventricle
Thick-walled cavity of the heart, propelling oxygen-rich blood into the aorta to irrigate the body.

leg
Part of the lower limb between the knee and ankle.

lesser occipital nerve
Nerve arising from the cervical plexus, innervating mainly the skin of part of the pinna.

lesser pectoral muscle
Flat muscle connecting the third, fourth and fifth ribs to the coracoid process of the scapula; it allows the shoulder to be lowered or the ribs to be raised, thus contributing to inhaling.

lesser trochanter
Protrusion of the internal part of the upper extremity of the femur, where the tendon of the iliopsoas inserts.

lesser tubercle
Anterior protrusion of the neck of the humerus, where the subscapular muscle inserts.

lesser zygomatic muscle
Muscle connecting the zygomatic bone to the upper lip; it assists in smiling and laughing.

ligament of ovary
Ligament connecting the ovary to the upper part of the uterus.

linea alba
Vertical band of fibrous tissue separating the two right muscles of the abdomen.

lingual tonsil
Each of two lymphoid organs located at the base of the tongue, contributing to the immune defense.

lingula of left lung
Lower portion of the superior lobe of the left lung.

little finger
Fifth and smallest digit of the hand.

liver
Large gland, located in the upper right abdomen, playing an important role in digestion and metabolism.

lobes of mammary gland
Parts of the mammary gland, secreting milk in the lactiferous sinuses.

long abductor muscle of thumb
Muscle connecting the radius and ulna to the base of the first metacarpal; it assists the thumb to extend and allows it to move away from the axis of the hand (abduction).

long adductor muscle
Muscle connecting the pubis to the femur; it allows the thigh to move toward the axis of the body (adduction), rotate outward and flex.

long extensor muscle of great toe
Muscle connecting the tibia to the distal phalanx of the big toe; it allows extension of the big toe and dorsal flexion of the foot.

long extensor muscle of thumb
Muscle connecting the ulna to the distal phalanx of the thumb, allowing it to extend.

long extensor muscle of toes
Muscle connecting the fibula and lateral condyle of the tibia to the last four toes; it allows them to extend.

long fibular muscle
Muscle connecting the tibia and fibula to the medial cuneiform and first metatarsal bones; it assists in several movements of the foot (abduction, plantar flexion, outward rotation).

long flexor muscle of great toe
Muscle connecting the fibula to the distal phalanx of the big toe, allowing its plantar flexion.

long flexor muscle of thumb
Muscle connecting the radius to the distal phalanx of the thumb, allowing it to flex.

long flexor muscle of toes
Muscle connecting the tibia to the distal phalanges of the last four toes, assisting in their flexion.

long head of biceps of arm
Part of the brachial biceps inserting into the scapula, above the glenoid cavity.

long head of biceps of thigh
Part of the femoral biceps inserting on the ischial tuberosity.

long head of triceps of arm
Part of the brachial triceps inserting on the infraglenoid tubercle of the scapula.

long palmar muscle
Muscle connecting the medial epicondyle of the humerus to the palmar aponeurosis; it allows flexion of the wrist.

long radial extensor muscle of wrist
Muscle connecting the humerus to the second metacarpal; it allows the hand to fold backward (extension) and to move away from the axis of the body (abduction).

long thoracic nerve
Nerve originating from the brachial plexus, innervating mainly the serratus anterior muscle.

longitudinal cerebral fissure
Deep sulcus separating the two cerebral hemispheres.

lower canine
Canine of the lower dental arch, located between the lateral incisor and first premolar.

lower central incisor
Incisor located in the front section of the lower dental arch.

lower first molar
Molar of the lower dental arch, located between the second premolar and second molar.

lower first premolar
Premolar of the lower dental arch, located between the canine and second premolar.

lower lateral incisor
Incisor of the lower dental arch, located between the central incisor and canine and serving to cut food.

lower limb
Appendage formed by the thigh, leg and foot, connected to the trunk at the hip and allowing upright stance and locomotion.

lower lip
Lip forming the lower contour of the mouth.

lower second molar
Molar of the lower dental arch, located between the first molar and wisdom tooth.

lower second premolar
Premolar of the lower dental arch, located between the first premolar and the first molar.

lower third molar
Last molar of the lower dental arch.

lumbar arteries
Branches of the abdominal aorta, irrigating mainly the posterior and lateral abdominal muscles.

lumbar ganglia
Sympathetic ganglia located on either side of the body of the lombar vertebrae.

lumbar nerves
All five pairs of spinal nerves, innervating the abdominal wall and thighs.

lumbar quadrate muscle
Flat muscle connecting the iliac crest to the twelfth rib; it allows lateral inclination of the trunk.

lumbar veins
Veins draining especially blood from the posterior abdominal wall, lombar region of the spinal cord and meninges; they then join various veins of the thorax.

lumbar vertebrae
Massive vertebrae (5) located beneath the thoracic vertebrae at the abdomen.

lumbosacral trunk
Nerve formed by the fourth and fifth lombar nerves, ending at the sacral plexus.

lumbrical muscles of hand
Small muscles inserted into the flexor tendons, assisting in the flexion of the metacarpophalangeal joint and extension of the interphalangeal joints.

lunate bone
Semilunar bone of the upper row of the carpus, articulating with the radius and other bones of the carpus at the wrist.

lunate surface
Peripheral part of the acetabulum.