FOSSA 



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FOSSA 



F.s, Postcranial. F. cranii anterior, one of the pre- 

 cranial fossas. F. cranii media, one of the meso- 

 cranial fossas. F. cranii posterior, one of the post- 

 cranial fossas. F. cystica, F. cystidis felleae, the 

 fissure for the gallbladder. F. Douglasii, Douglas' 

 pouch. F. elliptica. See F^ea hemielliptica (Illus. 

 Diet.). F., Epigastric. See /"'., Infrasternal. F. 

 glossoepiglottica, a slight oblong depression on each 

 side of the glossoepiglottic ligament. F., Hart- 

 mann's, a small, infundibular fossa of the peritoneum 

 lying between Turner's inferior ligament and the meso- 

 appendix. Syn., F. ileocaecalis infima ; F. subccecalis. 

 F. helicis, F. of the Helix. See F. scaphoidea (Il- 

 lus. Diet.). F. hemielliptica. See Fovea hemiel- 

 liptica (Illus. Diet.). F. hemisphaerica. See F. 

 hemisphcerica (Illus. Diet.). Fossae hepatis, the 

 fissures of the liver. F. hypophyseos. See F., 

 Pituitary (Illus. Diet.). F. ileocaecalis anterior, 

 an inconstant pouch of the peritoneum upon the upper 

 border of the ileocecal valve ; open above and on the 

 left side. Syn., F. ileoccecalis superior. F. ileocae- 

 calis infima. See F., Hartmann's. F. ileocaecalis 

 superior. See F. ileoccecalis anterior. F., Ileocolic. 

 See F., Luschkd 1 s. F. iliacosubfascialis. See F., 

 BiesiadeckVs. F. iliopectinea, Scarpa's triangle. 

 F. incudis, a depression in the upper part of the dor- 

 sal wall of the tympanic cavity which accommodates 

 the short process of the incus. F. infraspinata, F., 

 Infraspinous, the recess on the posterior surface of 

 the scapula occupied by the infraspinous muscle. F., 

 Infrasternal. See Infrasternal Depression (Illus. 

 Diet.). F., Inguinal. See Pcuch, Inguinal (Illus. 

 Diet.). F. innominata. See F. anthelicis. F., 

 Intercondylar, F., Intercondyloid. See under In- 

 tercondylar (Illus. Diet. ). F., Intercrural, F. inter- 

 cruralis. See Interpeduncular Space (Illus. Diet.). 

 F., Ischiorectal, F. ischiorectalis. See under Ischi- 

 orectal (Illus. Diet.). F., Jobert's, one formed in 

 the popliteal region, above by the adductor magnus, 

 below by the sartorius and gracilis. It is well seen 

 when the knee is bent and the thigh rotated strongly 

 outward. F., Landzert's, a fossa in the peritoneal 

 cavity that is bounded behind by the parietal perito- 

 neum covering the psoas, the renal vessels, the ureter, 

 and a part of the left kidney, and below by the meso- 

 colic fold. Syn., Paraduodenal fossa ; Recessus veno- 

 sus. F., Luschka's, a narrow fossa bounded by the 

 ileocolic fold in front, and by the enteric mesentery, 

 the ileum, and a small portion of the upper and inner 

 walls of the cecum behind. Syn., Ileocolic fossa. F., 

 Mastoid, F. mastoidea, the groove extending along 

 the inner surface of the mastoid portion of the tem- 

 poral bone, and forming part of the lateral sinus. F. 

 maxillaris, F., Maxillary. See F., Canine (Illus. 

 Diet.). F. maxima. See Olecranoid F. (Illus. 

 Diet. ). F.s, Mental, F. mentalis, two shallow de- 

 pressions, one on each side of the mental protuberance 

 of the mandible. F., Mesentericoparietal. See 

 F., Brosike's. F.s, Mesocranial, F.s, Middle of 

 the Skull, one of the three pairs (right and left) of 

 fossas into which the interior base of the cranium is 

 divided; they are deeply concave on a much lower 

 level than the precranial fossas and lodge the spheno- 

 temporal lobes of the cerebrum. Cf. F.s, Precranial, 

 F.s, Postcranial. F., Morgagni's. I. The fossa 

 navicularis of the urethra. 2. The concave interspace 

 between the upper border of the superior constrictor 

 muscles of the pharynx and the basilar process of the 

 occipital bone. F. navicularis. (See Illus. Diet.) 

 2. A depression at the dorsal extremity of the vulva 

 between the vaginal orifice and the posterior commis- 

 sure. 3. See F. scaphoidea (1 and 2). F. olec- 



ranii, F., Olecranon. See Olecranoid F. (Illus. 

 Diet.). F. ovalis, F. ovalis auris. See Fovea 

 hemielliptica (Illus. Diet.). F., Ovarian, F. ovarii 

 (peritonaei). See /•"., Claudius 1 . F.s, Pacchionian. 

 See under Pacchionian (Illus. Diet.). F., Parace- 

 cal, F. paracaecalis, an infrequent peritoneal pouch 

 behind and to one side of the cecum. F., Para- 

 duodenal. See F., Landzert's. F., Parajeju- 

 nal. See F., Brosike's. F. pararectalis. See 

 Pararectal Pouch (Illus. Diet.). F., Paravesical. 

 See Paravesical Pouch (Illus. Diet.). F., Parietal, 

 F. parietalis. See under Parietal (Illus. Diet. ). 

 F., Patellary. See /'. hyoidea (Illus. Diet.). F. 

 perinaei, the ischiorectal fossa. F. petrosa. See 

 Fossula petrosa. F. phrenicohepatica, a pouch of 

 the peritoneum between the left lateral ligament of the 

 liver and the extremity of the left lobe. F., Popli- 

 teal, F. poplitea. Same as Popliteal Space. F., 

 Portal, the portal fissure. F.s, Postcranial, the 

 lowest in position of the three pairs (right and left) of 

 the cranial fossas ; they lodge the cerebellum, pons, 

 and oblongata. Each fossa is formed by the posterior 

 surface of the pyramid and inner surface of the mas- 

 toid portion of the temporal bone and the inner sur- 

 face of the occipital bone below the horizontal limb 

 of the occipital cross. F., Posterior (of the skull). 

 See F., Postcranial. F., Postscapular. See F., 

 Infraspinous. F.s, Precranial, the most elevated in 

 position of the three pairs (right and left) of fossas 

 into which the internal base of the skull is divided. 

 They lodge the frontal lobes of the brain and are 

 formed by the orbital plates of the frontal bones, the 

 cribriform plate of the ethmoid bone, and the small 

 wings of the sphenoid bone. Cf. F.s, Mesocranial, F.s, 

 Postcranial. F., Prescapular. See Supraspinous F. 

 (Illus. Diet.). F. pterygomaxillaris, F., Pterygo- 

 maxillary, F. pterygopalatine, F., Pterygopala- 

 tine. See F., Sphenomaxillary (Illus. Diet.). F., 

 Pubovesical, F. pubovesicalis. See Abdominoz-esi- 

 cal Pouch (Illus. Diet. ). F., Radial, F. radialis, the 

 depression on the humerus above the capitellum which 

 accommodates the head of the radius in extreme flexion 

 of the forearm. F. rectouterina. F., Rectouterine. 

 See Douglas 1 Pouch (Illus. Diet.). F.s, Retromal- 

 leolar, the longitudinal grooves on each side of the 

 tendo Achillis. F. rhomboidalis, F. rbomboitiea, 

 the fourth ventricle. F. rotunda. See Fovea hemi- 

 sphaerica (Illus. Diet). F., Scaphoid, F. scaph- 

 oidea. (See Illus. Diet.) 2. A shallow depression 

 at the base of the internal pterygoid plate in which 

 the tensor palati has its origin. Syn., F. tensoris 

 palati : F. navicularis. F. sellae turcicae. See P., 

 Pituitary (Ilhis Diet.). F. semielliptica. See 

 Fovea hemielliptica (Illus. Diet.). F. semilunaris, 

 one running transversely at the ventral part of the 

 superior vermiform process. F. semilunaris major 

 (ulnae), the great sigmoid cavity. F. semilunaris 

 minor ( ulnae I, the lesser sigmoid cavity. F. semi- 

 ovalis. See Fovea hemielliptica (Illus. Diet. 1 ). F. 

 sigmoidea cubitus, F. sigmoidea major, the great 

 sigmoid cavity. F. sigmoidea minor, the lesser sig- 

 moid cavity. F. sigmoidea ossis temporalis, one 

 on the inner aspect of the mastoid portion of the tem- 

 poral bone in which the mastoid foramina open. F. 

 stylotympanomastoidea. See P., Glenoid (Illus. 

 Diet. ). F. subarcuata, F., Subarcuate, an orifice 

 situated in the newborn on the superior margin 

 of the petrosa, through which the vessels pass to the 

 temporal bone. This opening disappears after birth 

 and is represented in die adult by a depression beneath 

 the arcuate eminence. F. subauricularis, the de- 

 pression just below the external ear. F., Subcecal, 



