| navicular fossa of urethra | The terminal dilated portion of the urethra in the glans penis. Synonym: fossa navicularis urethrae, fossa terminalis urethrae, Morgagni's fossa, Morgagni's fovea. (05 Mar 2000) |
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| subarcuate fossa | An irregular depression on the posterior surface of the petrous portion of the temporal bone just below its crest and above and lateral to the internal acoustic meatus. In the foetus, the flocculus of the cerebellum rests here; in the adult, a small vein enters the bone here. Synonym: fossa subarcuata, floccular fossa, hiatus subarcuatus. (05 Mar 2000) |
| subcaecal fossa | An inconstant depression in the peritoneum extending posterior to the caecum. Synonym: Treitz's fossa. (05 Mar 2000) |
| subinguinal fossa | The depression on the anterior surface of the thigh beneath the groin. (05 Mar 2000) |
| sublingual fossa | A shallow depression on either side of the mental spine, on the inner surface of the body of the mandible, superior to the mylohyoid line, lodging the sublingual gland. Synonym: fovea sublingualis, sublingual pit. (05 Mar 2000) |
| submandibular fossa | The depression on the medial surface of the body of the mandible inferior to the mylohyoid line in which the submandibular gland is lodged. Synonym: fovea submandibularis, fossa submandibularis, fovea submaxillaris, submaxillary fossa. (05 Mar 2000) |
| submaxillary fossa | The depression on the medial surface of the body of the mandible inferior to the mylohyoid line in which the submandibular gland is lodged. Synonym: fovea submandibularis, fossa submandibularis, fovea submaxillaris, submaxillary fossa. (05 Mar 2000) |
| subscapular fossa | The concave ventral aspect of the body of the scapula giving origin to the subscapularis muscle. Synonym: fossa subscapularis. (05 Mar 2000) |
| superior duodenal 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) |
| 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) |
| 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) |