| inguinal crest | An elevation in the body wall of the embryo at the internal opening of the inguinal canal; part of the gubernaculum testis develops within it. (05 Mar 2000) |
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| intermediate line of iliac crest | The line on the crest of the ilium between the outer and inner lips, for origin of internal oblique muscle. Synonym: linea intermedia cristae iliacae. (05 Mar 2000) |
| internal lip of iliac crest | The roughened inner margin of the crest that gives attachment to parts of the transversus abdominis, quadratus lumborum, and erector spinae muscles. Synonym: labium internum cristae iliacae. (05 Mar 2000) |
| internal occipital crest | A ridge running from the internal occipital protuberance to the posterior margin of the foramen magnum, giving attachment to the falx cerebelli. Synonym: crista occipitalis interna. (05 Mar 2000) |
| interosseous crest | Edge of a bone to which a fibrous (interosseous) membrane is attached, by which the bone becomes attached to another bone. See: interosseous border of fibula, interosseous border of radius, interosseous border of tibia, interosseous border of ulna. Synonym: margo interosseus, interosseous crest, interosseous margin. (05 Mar 2000) |
| intertrochanteric crest | The rounded ridge that connects the greater and lesser trochanters of the femur posteriorly and marks the junction of the neck and shaft of the bone. Synonym: crista intertrochanterica, trochanteric crest. (05 Mar 2000) |
| obturator crest | A ridge that extends from the pubic tubercle to the acetabular notch, giving attachment to the pubofemoral ligament of the hip joint. Synonym: crista obturatoria. (05 Mar 2000) |
| terminal crest | A vertical crest on the interior wall of the right atrium that lies to the right of the sinus of the vena cava and separates this from the remainder of the right atrium. Synonym: tenia terminalis, terminal crest. (05 Mar 2000) |
| tibial crest | The sharp subcutaneous ridge of the tibia that extends from the tuberosity to the anterior part of the medial malleolus. Synonym: margo anterior tibiae, anticnemion, shin, tibial crest. (05 Mar 2000) |
| transverse crest | A horizontal ridge that divides the fundus of the internal acoustic meatus into a superior and an inferior area. In the former are the introitus of the facial canal and openings for the branches of the vestibular nerve to the utricle and to the ampullae of the anterior and lateral saemicircular canals. In the latter are openings for the cochlear nerve, and for branches of the vestibular nerve to the saccule and to the ampulla of the posterior saemicircular canal. Synonym: crista transversa, falciform crest, transverse crest. (05 Mar 2000) |
| transverse crest of internal acoustic meatus | A horizontal ridge that divides the fundus of the internal acoustic meatus into a superior and an inferior area. In the former are the introitus of the facial canal and openings for the branches of the vestibular nerve to the utricle and to the ampullae of the anterior and lateral saemicircular canals. In the latter are openings for the cochlear nerve, and for branches of the vestibular nerve to the saccule and to the ampulla of the posterior saemicircular canal. Synonym: crista transversa, falciform crest, transverse crest. (05 Mar 2000) |
| triangular crest | A crest or ridge which extends from the apex of a cusp of a premolar or molar tooth toward the central part of the occlusal surface. Synonym: triangular crest, triangular ridge. (05 Mar 2000) |
| trigeminal crest | That part of the cranial neural crest from which the ganglion of the fifth cranial nerve develops. (05 Mar 2000) |
| trochanteric crest | The rounded ridge that connects the greater and lesser trochanters of the femur posteriorly and marks the junction of the neck and shaft of the bone. Synonym: crista intertrochanterica, trochanteric crest. (05 Mar 2000) |
| tubercle of iliac crest | A prominence on the outer lip of the iliac crest about 5 cm behind the anterior superior iliac spine. Synonym: tuberculum iliacum, iliac tubercle. (05 Mar 2000) |