| spherical recess | A rounded depression on the inner wall of the vestibule of the labyrinth, lodging the sacculus. Synonym: recessus sphericus, fovea hemispherica, fovea spherica. (05 Mar 2000) |
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| splenic recess | The extension of the omental bursa toward the hilum of the spleen. Synonym: recessus splenicus, recessus lienalis. (05 Mar 2000) |
| subhepatic recess | The part of the peritoneal cavity between the visceral surface of the liver and the transverse colon. Synonym: recessus subhepaticus. (05 Mar 2000) |
| subpopliteal recess | The extension of the cavity of the knee joint between the tendon of the popliteus and lateral condyle of the femur. Synonym: recessus subpopliteus, bursa of popliteus. (05 Mar 2000) |
| superior azygoesophageal recess | The region above the azygos vein arch in which the right lung is in contact with the oesophagus. (05 Mar 2000) |
| superior duodenal recess | 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) |
| superior ileocaecal recess | A shallow pouch occasionally existing between the terminal ileum, the caecum, and the ileocolic artery when the latter is present. Synonym: recessus ileocaecalis superior. (05 Mar 2000) |
| superior omental recess | A portion of the vestibule of the bursa omentalis that extends upward between the inferior vena cava and the oesophagus. Synonym: recessus superior omentalis. (05 Mar 2000) |
| superior recess of lesser peritoneal sac | Pneumoenteric recess, a recess of the embryonic celom between the right lung bud and the gut; it is normally largely obliterated before birth, leaving only the superior recess of the vestibule of the lesser peritoneal sac as a vestige. (05 Mar 2000) |
| superior recess of tympanic membrane | A space in the mucous membrane on the inner surface of the tympanic membrane between the flaccid part of the membrane and the neck of the malleus. Synonym: recessus membranae tympani superior, Prussak's pouch, Prussak's space. (05 Mar 2000) |
| suprapineal recess | A variable diverticulum from the posterior portion of the third ventricle of the brain, running backward some distance above and beyond the pineal recess. Synonym: recessus suprapinealis. (05 Mar 2000) |
| supratonsillar recess | 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) |
| duodenojejunal recess | 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) |
| inferior duodenal recess | 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) |
| inferior ileocaecal recess | A deep fossa sometimes found between the ileocaecal fold, the mesoappendix, and the caecum. Synonym: recessus ileocaecalis inferior. (05 Mar 2000) |