| supramastoid fossa | A small depression on the mastoid part of the temporal bone, posterior to the suprameatal spine. Synonym: foveola suprameatica, mastoid fossa, fossa mastoidea, supramastoid fossa. (05 Mar 2000) |
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| supraspinous fossa | The hollow on the dorsal aspect of the scapula above the spine, lodging the supraspinatus muscle. Synonym: fossa supraspinata. (05 Mar 2000) |
| supratonsillar fossa | The interval between the palatoglossal and palatopharyngeal arches above the tonsil, most obvious after the tonsil has regressed in the adult. Synonym: fossa supratonsillaris, supratonsillar recess, Tourtual's sinus. (05 Mar 2000) |
| supravesical fossa | The depression on the peritoneal surface of the anterior abdominal wall above the bladder and between the median and medial umbilical folds. Its level, relative to the pubis, changes with filling of the bladder. Synonym: fossa supravesicalis, fovea supravesicalis. (05 Mar 2000) |
| digastric fossa | A hollow on the posterior surface of the base of the mandible, on either side of the median plane, giving attachment to the anterior belly of the digastric muscle. Synonym: fossa digastrica. (05 Mar 2000) |
| 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) |
| 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) |