| infraduodenal fossa | A peritoneal recess occasionally found behind the third part of the duodenum, between it and the aorta. Synonym: recessus retroduodenalis, infraduodenal fossa, retroduodenal fossa. (05 Mar 2000) |
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| infraspinous fossa | The hollow on the dorsal aspect of the scapula inferior to the spine, giving attachment chiefly to the infraspinatus muscle. Synonym: fossa infraspinata. (05 Mar 2000) |
| infratemporal fossa | The cavity on the side of the skull bounded laterally by the zygomatic arch and ramus of the mandible, medially by the lateral pterygoid plate, anteriorly by the zygomatic process of the maxilla, posteriorly by the articular tubercle of the temporal bone and the posterior border of the lateral pterygoid plate, and above by the squama of the temporal bone and the infratemporal crest on the greater wing of the sphenoid bone. Synonym: fossa infratemporalis, zygomatic fossa. (05 Mar 2000) |
| inguinal fossa | See: lateral inguinal fossa, medial inguinal fossa. (05 Mar 2000) |
| innominate fossa | A shallow depression between the false vocal cord and the aryepiglottic fold on either side. Synonym: fossa innominata. (05 Mar 2000) |
| intercondylar fossa | The deep fossa between the femoral condyles in which the cruciate ligaments are attached. Synonym: fossa intercondylaris, intercondyloid fossa, intercondylic fossa, intercondyloid notch, popliteal notch. (05 Mar 2000) |
| intercondyloid fossa | See: area intercondylaris anterior tibiae, area intercondylaris posterior tibiae. Synonym: intercondylar fossa. (05 Mar 2000) |
| interpeduncular fossa | Deep depression on the inferior surface of the mesencephalon, between the crura cerebri, the floor of which is formed by the posterior perforated substance. See: interpeduncular cistern. Synonym: fossa interpeduncularis. (05 Mar 2000) |
| intrabulbar fossa | The dilated commencement of the spongy part of the male urethra lying within the bulb of the penis. (05 Mar 2000) |
| ischioanal fossa | A wedge-shaped space with its base toward the perineum and lying between the tuberosity of the ischium and the obturator internus muscle laterally and the external anal sphincter and the levator ani muscle medially. Synonym: fossa ischiorectalis, ischioanal fossa, Velpeau's fossa. (05 Mar 2000) |
| ischiorectal fossa | A wedge-shaped space with its base toward the perineum and lying between the tuberosity of the ischium and the obturator internus muscle laterally and the external anal sphincter and the levator ani muscle medially. Synonym: fossa ischiorectalis, ischioanal fossa, Velpeau's fossa. (05 Mar 2000) |
| olecranon fossa | A hollow on the dorsum of the distal end of the humerus, just above the trochlea, in which the olecranon process of the ulna rests when the elbow is extended. Synonym: fossa olecrani, anconal fossa. (05 Mar 2000) |
| ovarian fossa | A depression in the parietal peritoneum of the pelvis; it is bounded in front by the obliterated umbilical artery, and behind by the ureter and the uterine vessels; it lodges the ovary. Synonym: fossa ovarica, Claudius' fossa. (05 Mar 2000) |
| temporal fossa | The space on the side of the cranium bounded by the temporal lines and terminating below at the level of the zygomatic arch. Synonym: fossa temporalis. (05 Mar 2000) |
| tonsillar fossa | The depression between the palatoglossal and palatopharyngeal arches occupied by the palatine tonsil. Synonym: fossa tonsillaris, amygdaloid fossa, sinus tonsillaris. (05 Mar 2000) |