FISSURE 



475 



FISSURE 



I 



difrontal (of Chven), an inconstant fissure, subdividing 

 the medifrontal convolutions. F., Meditemporal (of 

 Wilder), inconstant and irregular fissures, ven trad of 

 the supertemporai fissure. F., Meso-exognathic, 

 an occasional fissure in the superior maxilla between 

 the exognathion and mesognathion. F., Midfrontal. 

 See P., MedifrontaL F., Midoccipital. See F.- 

 Orbital. F., Midorbital. See F, Orbital. F.- 

 needle, a spiral needle for bringing together the lips 

 of a wound. F. of Nipple, a linear ulceration radi- 

 ating from the nipple during lactation. It results from 

 improper care of the breast. F., Occalcarine (of 

 Wilder), the common stem of which the occipital and 

 calcarine fissures are branches. F., Occipital. I (of 

 Otl'z>i), the mid-occipital fissure, an illy-defined, incon- 

 stant fissure on the dorso-caudal slope of the occipital 

 lobe ; 2 {of Pansch), a deep and constant fissure, 

 situated between the parietal and occipital lobes of the 

 brain ; the occipito-parietal. F., Occipital, Anterior 

 (of Schzualbe), a fissure between the occipito-temporal 

 and the inferior temporo-sphenoidal lobes of the brain. 

 F., Occipital, External. See F., Ape. F., Oc- 

 cipital, Inferior (of Clevenger) , a small fissure between 

 the second and third occipital convolutions. F"., 

 Occipital, Transverse (of Ecker), a transverse fissure 

 on the dorsal surface of the occipital lobe of the brain ; 

 it is part of the paroccipital fissure. F., Oc- 

 cipito-parietal. See F., Occipital. F., Occipito- 

 temporal. See F. Collateral. F. , Olfactory, a de- 

 pression on the ventral aspect of the frontal lobe, 

 lodging the olfactory bulb and cms. F., Orbital, a 

 fissure on the orbital surface of the frontal lobe exter- 

 nal to the olfactory fissure. F., Orbital, Anterior. 

 See F., Spkeno-maxillary. F. t Orbital, Posterior. 

 See F., Sphenoid. F., Orbito-frontal, a partial fis- 

 sure on the lateral aspect of the brain, separating the 

 super-frontal and orbital convolutions. F. of Owen. 

 See Fissures, Antorbital, Basirrhinal, Callosal, Coronal, 

 Ectoccipital, Ectofrontal, Octorrhinal, Ectosylvian, Ecto- 

 tentorial, Entoccipital, Entorbital, Falcial, Frontal, 

 Lambdoid, Marginal, Medifrontal, Occipital, Post- 

 frontal, Posthippocampal, Postoccipital, Postorbital, 

 Postseptal, Postsylvian, Rhinal, Septal, Subfalcial, 

 Subsylvian, Supercallosal, Supersylvian. F., Pal- 

 pebral, the space between the eyelids extending 

 from the outer to the inner canthus. F. of Pansch. 

 See F. , Occipital. F. of Pansch and Dalton. See 

 F, Parietal. F., Paracentral (of Wilder), a. fissure 

 on themesal surface of the cerebrum, surrounding the 

 paracentral lobule. F., Parallel. See F, Super- 

 temporal. F., Parietal. I (of Wilder), the parietal 

 portion of the intraparietal fissure ; 2 (of Pansch 

 and Dalton), a fissure between the parietal lobules, 

 beginning near the ventral end of the central fissure, 

 and running to near the tip of the occipital lobe ; 

 it includes the parietal and paroccipital fissures. F., 

 Parieto-occipital. See F, Occipital. F., Parieto- 

 occipital, External, the lateral portion of the occipital 

 fissure. F., Paroccipital (of Wilder), the occipital 

 portion of the intraparietal fissure. F., Peri- 

 toneal, a fissure of the lateral mesoblastic plates 

 of the embryo, constituting the rudiment of the great 

 visceral cavity. F., Perpendicular, External. See 

 F., Parieto-occipital, External and F., Ape. F., Per- 

 pendicular, Internal, the portion of the occipital fis- 

 sure on the mesal surface of the hemisphere. F., Petro- 

 squamosal, or Petro-squamous, a small fissure be- 

 tween the petrosa and internal surface of the squamosa. 

 F., Petro-tympanic, a fissure in the tympanic ring, 

 lodging the long process of the malleus. F., 

 Petroso-angular, a fissure between the apex of the 

 pyramidal portion of the petrosa and the great wing 



of the sphenoid. F., Petro-basilar, a fissure be- 

 tween the petrosa and the sphenoid and occiput, join- 

 ing the middle lacerated and jugular foramina. 

 F. -plane, a term employed to designate the entire 

 length and depth of a fissure of the brain. F., 

 Pomatic (of Wilder) , in monkeys, a fissure crossing 

 the cerebrum opposite the dorsal end of the occipital 

 fissure ; it forms the margin of the poma or oc- 

 cipital operculum. F., Portal. See P., Transverse 

 (of liver). F., Postcalcarine (of Wilder), an incon- 

 stant vertical fissure at the occipital end of the cere- 

 brum. F., Postcentral, a fissure just posterior and 

 parallel to the central fissure. F., Postero-inter- 

 mediary, a slight depression in the dorsal portion of 

 the cervical region of the spinal cord. F., Postero- 

 lateral, a groove on the posterior portion of the side 

 of the spinal cord, corresponding to the line of 

 emergence of the posterior roots of the spinal nerves. 

 F., Postero-median (of spinal cord). See P., 

 Median, Posterior (of spinal cord). F., Postfrontal 



iof Owen), the frontal fissure. F., Posthippocampal 

 of Owen). See F, Calcarine. F., Postoccipital 

 of Owen), an inconstant vertical fissure forming the 

 anterior boundary of the superior occipital convolu- 

 tion. F., Postorbital (of Owen), a portion of the 

 orbital fissure. F., Postparoccipital (of Wilder), 

 an inconstant fissure in the occipital portion of the par- 

 occipital gyrus. F., Postseptal (of Owen), a 

 small vertical fissure on the mesal surface of the 

 posterior portion of the occipital lobe. F., Post- 

 sylvian (of Owen), the supertemporai or parallel 

 fissure. F., Precentral, a fissure running parallel 

 with the ventral portion of the central fissure. F., 

 Precuneal, a right angled fissure in the precuneus. 

 F., Preoccipital, a fissure on the ventral aspect of 

 the brain, separating the occipital and temporal lobes. 

 F., Preorbital, the antorbital fissure. F., Preparoc- 

 cipital (of Wilder), a fissure in the parietal portion 

 of the paroccipital gyrus. F., Presylvian (of 

 Wilder), the anterior branch of the fissure of Sylvius. 

 F., Pterygoid, the space between the lower end;, of 

 the pterygoid plates of the ethmoid. F., Pterygo- 

 maxillary, a vertical fissure in the zygomatic fossa, 

 opening above into the spheno-maxillary fossa. F., 

 Pterygopalatine. See P., Pterygoid. F., Purse- 

 like (of Reil), the vallicula, q. v. F. of Reil. See 

 P., Purse-like. F., Reticular. See F. , Postcentral. 

 F., Rhinal (of Oiven), the fissure separating the ol- 

 factory bulb and cms from the cerebrum proper. F. 

 of Rolando. See F., Central. F., Rostral, 

 in Ungulates, a fissure on the mesal aspect of 

 the cerebmm. F., Sagittal. See P., Inter- 

 cerebral. F. of Santorini, two transverse fissures 

 in the cartilaginous auditory meatus. F. of 

 Schwalbe. See F. , Occipital, Anterior, and P. , Su- 

 percentral. F., Semilunar. See F. , Calcarine. F., 

 Septal (of Owen), an inconstant fissure in the cuneus, 

 posterior to the calcarine. F., Sphenoid, a tri- 

 angular fissure between the greater and lesser wings 

 of the sphenoid bone. It transmits the third, 

 fourth, sixth, and ophthalmic division of the fifth, 

 cranial nerves, and the ophthalmic vein. F., Spheno- 

 maxillary, a fissure between the orbital plate of the 

 sphenoid and the lateral margin of the superior 

 maxilla. F., Splenial, a fissure in the brain of the 

 dog near the splenius. F., Subcentral (of Wilder), 

 an inconstant fissure at the ventral end of the post- 

 central fissure. F., Subfalcial (of 0~ioen\. a small 

 fissure on the mesal surface of the frontal lobe. F., 

 Subfrontal, a fissure between the middle and inferior 

 frontal convolutions. F., Suboccipital, an incon- 

 stant fissure in the occipital convolution of the brain. 



