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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

i
TERMS AND DEFINITIONS
LINKS TO THE VIRTUAL HUMAN BODY
ileum
Terminal segment of the small intestine, connecting with the large intestine.

iliac crest
Upper border of the iliac bone.

iliac muscle
Muscle connecting the iliac fossa to the lesser trochanter; it mainly allows flexion of the thigh.

ilio-inguinal nerve
Nerve arising from the lombar plexus, innervating the skin of part of the abdomen, genitalia and thigh.

iliofemoral ligament
Triangular ligament extending between the ilium and femur, on the anterior side of the hip.

iliohypogastric nerve
Nerve arising from the lombar plexus, innervating the skin of part of the abdominal wall and genitalia.

iliotibial tract
Thick part of the fascia lata, descending from the iliac crest and covering the lateral part of the thigh to the lateral condyle of the tibia; it assists in stabilizing the hip joint.

ilium
Upper part of the iliac bone, flared in shape.

incisive canals
Small canals allowing the passage of blood vessels and nerves between the nasal cavity and the oral cavity.

incisive foramina
Apertures of the hard palate, allowing the passage of nasopalatine nerves.

incisor
Each of eight flat teeth located in the front of the maxilla and mandible, having a cutting edge that allows them to bite into food.

index finger
Second digit of the hand.

inferior alveolar artery
Branch of the maxillary artery, irrigating the lower jaw and chin.

inferior angle of scapula
Angle formed by the juncture of the medial and lateral borders of the scapula.

inferior colliculus
Each of two elevations located on the dorsal side of the midbrain, below; they are part of the auditory pathways.

inferior epigastric artery
Branch of the external iliac artery, irrigating the anterior and low abdominal wall.

inferior epigastric vein
Vein of the abdominal region, emptying into the external iliac vein.

inferior extensor retinaculum
Ligament of the anterior side of the ankle, between the two malleoluses, anchoring the muscle tendons during dorsal movements of the foot.

inferior fibular retinaculum
Ligament extending from the calcaneus to the retinaculum of the extensor muscles, anchoring the long and short fibular muscles to the outer side of the foot.

inferior gluteal artery
Branch of the internal iliac artery, irrigating the buttock and back of the thigh.

inferior gluteal nerve
Nerve arising from the sacral plexus, innervating the gluteus maximus muscle and the skin at the back of the thigh.

inferior gluteal veins
Veins draining blood from the back of the thigh and muscles of the buttock; they unite in a common trunk that joins the internal iliac vein.

inferior labial artery
Branch of the facial artery, irrigating the lower lip.

inferior labial veins
Veins carrying blood from the region of the lower lip to the facial vein.

inferior lobe
Lower part of the lung separated from the superior lobe and middle lobe (in the right lung) by an oblique fissure.

inferior mesenteric artery
Anterior branch of the abdominal aorta, irrigating the descending colon and left half of the transverse colon.

inferior nasal concha
Paired bone, fine and curved, located in the lower part of the nasal cavity.

inferior phrenic artery
Lateral branch of the abdominal aorta, irrigating the diaphragm and surrenal glands.

inferior phrenic veins
Veins collecting blood from the inferior part of the diaphragm; the right phrenic vein empties into the inferior vena cava, while the left phrenic vein empties into the left surrenal vein.

inferior rectal nerves
Nerves arising from the sacral plexus, innervating the anal region.

inferior superficial inguinal lymph nodes
Nodes located beneath the saphenous vein, filtering lymph from superficial elements of the lower limb.

inferior thyroid artery
Terminal branch of the thyrocervical trunk, irrigating the thyroid gland.

inferior thyroid vein
Small vein receiving the blood of the isthmus of the thyroid gland and emptying into the left brachiocephalic vein.

inferior trunk of brachial plexus
Part of the brachial plexus formed by the eighth cervical nerve and the first thoracic nerve.

inferior ulnar collateral artery
Branch of the brachial artery, irrigating the muscles of the elbow and forearm.

inferior vena cava
Vein draining blood from the regions of the body located below the diaphragm into the right atrium.

infra-orbital artery
Branch of the maxillary artery, irrigating the region of the maxilla, upper dental arch, nose and cheek.

infraorbital foramen
Front aperture of the maxilla, allowing the passage of the nerves and blood vessels of the face.

infraorbital nerve
Branch of the maxillary nerve, innervating the cheek, upper lip and lower eyelid.

infraspinous fascia
Fascia covering the infraspinous muscle.

infraspinous muscle
Muscle connecting the scapula, beneath the spine, to the greater tubercle of the humerus; it especially allows the outward rotation of the arm.

infundibulum of uterine tube
Extremity of the uterine tube, in which the ovule penetrates.

inguinal ligament
Ligament extending from the anterior superior iliac spine to the pubis; it also forms the lower border of the aponeurosis of the external oblique muscle of the abdomen.

innermost intercostal muscles
Muscles of the thoracic cage, connecting the ribs to each other; with the inner and outer intercostal muscles, they assist in maintaining the thoracic cage.

intercapitular veins of hand
Veins ensuring communication between the palmar and dorsal venous systems of the hand.

intercostal lymph nodes
Nodes located between the ribs, filtering lymph especially from the posterior part of the trunk and parietal pleura.

intercostal nerves
Nerves innervating the intercostal muscles, as well as part of the diaphragm and abdominal wall.

intermediate nerve
Sensory root of the facial nerve, especially innervating the submandibular and sublingual glands.

internal carotid artery
Branch of the common carotid artery, irrigating the encephalus and eyeballs.

internal iliac artery
Terminal branch of the common iliac artery, irrigating the pelvis, genitalia and inner thigh.

internal iliac lymph nodes
Nodes grouped near the internal iliac vein and artery, filtering lymph from the viscera of the pelvic region, perineum and buttocks.

internal iliac vein
Vein of the lower part of the pelvis, joining the external iliac vein to form the common iliac vein.

internal intercostal muscles
Muscles of the thoracic cage, connecting the ribs to each other; chiefly active during exhalation, they especially allow the ribs to be lowered.

internal jugular vein
Vein draining blood from the brain, face and neck; it joins the subclavian vein to form the brachiocephalic vein.

internal oblique muscle
Muscle connecting the iliac crest to the last four costal cartilages; it allows flexion and rotation of the trunk, as well as compression of the internal organs.

internal pudendal artery
Branch of the internal iliac artery, irrigating the external genitalia, anal canal and perineum.

internal pudendal vein
Vein carrying blood from the region of the perineum to the internal iliac vein.

internal thoracic artery
Branch of the subclavian artery, irrigating the anterior part of the thoracic cage, anterior parts of the mediastinum and diaphragm.

internal thoracic veins
Veins carrying blood from the anterior part of the thorax to the brachiocephalic vein.

interosseous membrane of forearm
Thin fibrous membrane connecting the medial border of the radius and the lateral border of the ulna; it serves as an insertion point for various muscles.

interthalamic adhesion
Small area of gray matter connecting the medial side of the two thalamuses; it is variable.

interureteric crest
Membranous fold connecting the two internal ureteric orifices, forming the summit of the trigone of the urinary bladder.

interventricular septum
Inner wall of the heart, separating the two ventricles.

intervertebral disk
Flat, rounded cartilaginous structure separating the vertebrae; its elasticity provides mobility to the vertebral column.

iris
Colored part of the front portion of the eye, made up of smooth muscles whose contraction and dilatation change the diameter of the pupil.

ischial spine
Bony protrusion of the ischium where various muscles and ligaments insert.

ischial tuberosity
Bony vertical protrusion of the lower extremity of the ischium.

ischium
Lower part of the iliac bone.

isthmus of uterine tube
Narrow part of the uterine tube, opening into the uterus.