| digital fossa | A depression at the root of the neck of the femur beneath the curved tip of the great trochanter; it gives attachment to the tendon of the obturator externus. Synonym: fossa trochanterica, digital fossa. (05 Mar 2000) |
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| duodenojejunal fossa | A peritoneal recess extending upward behind the superior duodenal fold. Synonym: recessus duodenalis superior, duodenojejunal fossa, duodenojejunal recess, Jonnesco's fossa, superior duodenal fossa. (05 Mar 2000) |
| iliac fossa | The smooth inner surface of the ilium above the arcuate line, giving attachment to the iliacus muscle. Synonym: fossa iliaca. (05 Mar 2000) |
| iliacosubfascial fossa | A peritoneal recess between the psoas muscle and the crest of the ilium. Synonym: Biesiadecki's fossa, fossa iliacosubfascialis. (05 Mar 2000) |
| iliopectineal fossa | A hollow between the iliopsoas and pectineus muscles in the centre of the femoral triangle, lodging the femoral vessels and nerve. (05 Mar 2000) |
| incisive fossa | The depression in the midline of the bony palate behind the central incisors into which the incisive canals open. Synonym: fossa incisiva. (05 Mar 2000) |
| incudal fossa | A small depression in the lower and posterior part of the epitympanic recess that lodges the short limb of the incus. Synonym: fossa for incus, incudal fossa. (05 Mar 2000) |
| inferior duodenal fossa | The variable peritoneal recess which lies behind the inferior duodenal fold and along the ascending part of the duodenum. Synonym: recessus duodenalis inferior, Gruber-Landzert fossa, inferior duodenal fossa. (05 Mar 2000) |
| infraclavicular fossa | A triangular depression bounded by the clavicle and the adjacent borders of the deltoid and pectoralis major muscles. Synonym: fossa infraclavicularis, deltoideopectoral triangle, deltoideopectoral trigone, infraclavicular triangle, Mohrenheim's fossa, Mohrenheim's space, regio infraclavicularis, trigonum deltoideopectorale. (05 Mar 2000) |
| 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) |
| 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) |
| 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) |