FISSURE 



476 



FISTULA 



F., Suborbital, a fissure in the superior maxillary 

 portion of the floor of the orbit. It is the upper 

 termination of the infraorbital canal. F., Subseptal, 

 a fissure on the cuneus between the calcarine and the 

 collateral fissures. F., Subsylvian. I (of Owen), an 

 inconstant fissure on the ventral aspect of the frontal 

 lobe ; 2 (of Wilder) , the constant horizontal branch of 

 the fissure of Sylvius. F., Subtemporal, an inconstant 

 fissure in the middle temporal and subtemporal convo- 

 lutions. F., Superior (of Burdach), a fissure of the 

 cerebrum between the lateral surface of the insula and 

 the ental surface of the operculum. F., Supercallosal. 

 I (of Wilder) , the cephalic portion of the calloso-mar- 



MESAL ASPECT. 



Lateral Aspect. — Preop. Preoperculum. 2. Subcentral 

 fissure. Mesal Aspect. — 3. Cuneolus ; the fissure cephalad 

 of it is the adoccipital. 



ginal fissure; 2 (of Owen), the calloso-marginal 

 fissure. F., Supercentral (of Schwalbe), the fissure 

 parallel to and cephalad of the dorsal portion of the 

 central fissure. F., Superfrontal, a fissure on the 

 lateral aspect of the frontal lobe, marking off the 

 second frontal convolution. F., Superoccipital, an 

 irregular fissure in the upper portion of the occipital 

 surface of the posterior lobe of the brain. F., 

 Superseptal, a fissure in the cuneus, almost parallel 

 with the occipital fissures. F., Supersylvian (of 

 Owen), in Carnivora, the second arched fissure on 

 the lateral surface of the cerebrum. F., Super- 

 temporal, a constant fissure parallel with the fissure 

 of Sylvius. F., Suprasylvian. See F., Supersylvian. 

 F. of Sylvius, a deep fissure of the brain beginning 

 on the outer side of the anterior perforated space, and 

 extending outward to the surface of the hemisphere. 

 It presents two short cephalic branches, subsylvian and 

 presylvian, and a long caudal branch, which separate 

 the parietal and temporo-sphenoidal lobes. The insula 

 is situated between the divisions. F., Sylvian. See 

 F. of Sylvius. F., Temporal, First. See F., Super- 



temporal. F., Temporal, Inferior. See F., Subtem- 

 poral. F., Temporo-occipital. See F., Collateral. 

 F., Temporosphenoidal, a name applied to both 

 the supertemporal and subtemporal fissures. F., 

 Temporosphenoidal, Superior. See F., Supertem- 

 poral. F., Tentorial. See F. , Collateral. F., Trans- 

 verse (of brain), the transverse fissure separating 

 the anterior from the posterior and middle portions 

 of the brain. It transmits the folds of pia that form 

 the choroid plexus. F., Transverse (of cerebellum). 

 See F., Horizontal (of cerebellum). F., Transverse 

 (of liver) , a fissure crossing transversely the lower sur- 

 face of the right lobe of the liver. It transmits the 

 portal vein, hepatic artery and nerves, and hepatic duct. 

 F., Transverse, Great (of brain). See F., Trans- 

 verse (of brain). F., Transverse, Inferior, a fissure 

 between the cerebellum and the oblongata. It transmits 

 a fold of the pia to the fourth ventricle. F., Trans- 

 verse, Superior. SeeF., Transverse (of brain) . F., 

 Transinsular (of Wilder), the deepest of the fissures 

 crossing the insula. F., Transtemporal, one of the 

 inconstant short fissures on the lateral surface of the 

 temporal lobe. F., Triradiate. See F, Orbital. F., 

 Umbilical, the anterior portion of the longitudinal 

 fissure of the liver, separating the left and quadrate 

 lobes. F., Uncinate. See F., Collateral. F., 

 Ventral. See F., Median, Anterior (of spinal cord). 

 F., Wernicke's, an inconstant vertical fissure on the 

 lateral surface of the cerebrum midway between the 

 end of the fissure of Sylvius and the caudal end of the 

 cerebrum ; the exoccipital fissure. F. of Wilder. 

 See Fissures, Adoccipital, Amygdaline, Basisylvian, 

 Circuminsular, Constant, Episylvian, Exoccipital, In- 

 ter cerebral , Insular, Interlobar, Intergyral, Intragyral, 

 Intraparacentral , Lambdoid, Meditemporal , Para- 

 central, Paroccipital, Fomatic, Postcalcarine, Post- 

 par occipital, Preparoccipital, Presylvian, Subcentral, 

 Subsylvian, Supercallosal, Transinsular , Zygal. F., 

 Zygal (of Wilder) , any fissure that presents a pair of 

 branches at either end of a connecting bar. F., Zygo- 

 matico-sphenoid, a space between the orbital surface 

 of the great wing of the sphenoid and the malar 

 bone. 



Fissured (fish' '-urd) \_fissus ; findere ,\.o cleave]. Cleft; 

 split. 



Fist [ME., fist, the fist]. 1. The firmly-closed hand. 2. 

 Same as Bovista. 



Fistula (fis' -tu-lah) [L. , a "pipe "]. An abnormal, 

 tube-like passage in the body. F., Aerial, a small 

 opening in the neck communicating with the larynx, 

 following imperfect closure of incised wounds of the 

 throat. The voice is defective in consequence. F., 

 Anal, an abnormal channel of communication between 

 the bowel and the surface in the neighborhood of the 

 anus. F., Biliary, an abnormal channel of com- 

 munication with a biliary duct or the gall-bladder. 

 F., Blind, a variety of anal, urinary, or other abnor- 

 mal tract with but one opening. F., Blind, External, 

 an anal fistula/with but one opening, and that external. 

 F., Blind, Internal, an anal fissure with but one open- 

 ing, and that internal. F., Blind, Urinary, a suppurat- 

 ing track opening into the urethra, but without external 

 opening. F., Branchial, an opening that extends 

 from the surface of the neck to the pharynx ; it is 

 an unclosed branchial cleft, a relic of fetal life. F., 

 Complete, one having two openings, an internal and 

 external. F., Fecal, an abdominal fistula, communi 

 eating with the intestine. F., Gastric, an opening 

 into the stomach, generally artificial, through the ab- 

 dominal wall. ll is sometimes used for feeding ■ 

 patient who cannot swallow. F., Horseshoe, a vari- 

 ety of fistula in ano, the external opening being on 



