| retroduodenal 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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| retromandibular fossa | The depression inferior to the auricle and posterior to the ramus and angle of the mandible. Synonym: fossa retromandibularis. (05 Mar 2000) |
| retromolar fossa | A triangular depression in the mandible posterior to the third molar tooth. (05 Mar 2000) |
| Merkel's fossa | A groove in the posterolateral wall of the vestibule of the larynx between the corniculate and cuneiform cartilages. (05 Mar 2000) |
| mesentericoparietal fossa | A peritoneal fossa that has been seen in a few cases in which the jejunum has no mesentery but is attached to the posterior parietal peritoneum; the fossa begins at the point where the mesentery ends, and is seen on raising up the knuckle of free intestine. Synonym: Broesike's fossa, fossa parajejunalis, mesentericoparietal fossa, mesentericoparietal recess. (05 Mar 2000) |
| rhomboid fossa | The floor of the fourth ventricle of the brain, formed by the ventricular surface of the rhombencephalon. Synonym: fossa rhomboidea. (05 Mar 2000) |
| greater supraclavicular fossa | The triangle bounded by the clavicle, the omohyoid muscle, and the sternocleidomastoid muscle; it contains the subclavian artery and vein. Synonym: fossa supraclavicularis major, trigonum omoclaviculare, greater supraclavicular fossa, omoclavicular triangle, subclavian triangle. (05 Mar 2000) |
| Gruber-Landzert 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) |
| petrosal fossa | A small and often only faintly marked depression on the inferior surface of the petrous portion of the temporal bone, between the jugular fossa and the opening of the carotid canal; here opens the canaliculus tympanicus transmitting the tympanic nerve. Synonym: fossula petrosa, petrosal fossa, receptaculum ganglii petrosi. (05 Mar 2000) |
| Rosenmuller's fossa | A slitlike depression in the membranous (non-muscular) pharyngeal wall extending posterior to the opening of the auditory (eustachian) tube. Synonym: recessus pharyngeus, recessus infundibuliformis, Rosenmuller's fossa, Rosenmuller's recess. (05 Mar 2000) |
| middle cranial fossa | A butterfly-shaped portion of the internal base of the skull posterior to the sphenoidal ridges and limbus and anterior to the crests of the petrous part of the temporal bones and dorsum sellae; it lodges the temporal lobes of the brain in the lateral portions, and the hypophysis centrally. Synonym: fossa cranii media. (05 Mar 2000) |
| cistern of lateral fossa of cerebrum | An elongated expansion of the subarachnoid space where the arachnoid bridges over the opening of the Sylvian fissure. Synonym: cisterna fossae lateralis cerebri. (05 Mar 2000) |
| Claudius' 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) |
| Mohrenheim's 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) |
| piriform fossa | A recess in the anterolateral wall of the nasopharynx on each side of the vestible of the larynx separated from it by the aryepiglottic folds. Synonym: recessus piriformis, piriform recess, piriform sinus. (05 Mar 2000) |