. Anatomy, descriptive and applied. Anatomy. 920 THE NERVE SYSTEM which is concomitant with the comparatively late phyletic and embryonic develop- ment of the two secondary fissures described. Other, less important, fissures are: (1) the inflected fissure (fissura inflexa), incising the dorsimesal border between the central fissure and the cephalic limb of the paracentral; (2) the radiate fissure, near the lateral orbitofrontal border; (3) the transprecentral, a short oblique piece ventrad of the central and usually dipping into the syhian cleft; and (4) the diagonal fissure between the presyl
. Anatomy, descriptive and applied. Anatomy. 920 THE NERVE SYSTEM which is concomitant with the comparatively late phyletic and embryonic develop- ment of the two secondary fissures described. Other, less important, fissures are: (1) the inflected fissure (fissura inflexa), incising the dorsimesal border between the central fissure and the cephalic limb of the paracentral; (2) the radiate fissure, near the lateral orbitofrontal border; (3) the transprecentral, a short oblique piece ventrad of the central and usually dipping into the syhian cleft; and (4) the diagonal fissure between the presylvian ramus and the ventral end of the central, and often confluent with the precentral (Fig. 678). 2. The mesal surface of the frontal lobe is bounded by the dorsimesal border, the mesorbital border, and the callosal fissure An arcuate fissure or system of fissures intermediate between the dorsimesal margin and the supercallosal fissure divides this surface into the superfrontal gyre, mesal aspect, and the callosal gyre. The name "callosomarginal" was usually applied to this fissure, but an examination of many brains reveals a certain integrality of fissural parts, which are not always connected. One constant segment from its relations with the central fissure is called the paracentral fissure, composed of a main stem with a cephalic and a caudal limb, embracing the paracentral gyre. Frontad thereof extends the supercallosal fissure, often in two segments, running a concentric course between the arched dorsimesal border and the genu of the callosum. The supercallosal may be confluent with the paracentral. The supercallosal is. SUPERCENTRAL f, = FISSURE G. = GYRE R. = RAMUS Fig. 678.—Fissures and gyres of the lateral surface of the left hemicerebrum. as a rule, quite ramified, its branches transcribing the superfrontal gyre. In the prefrontal region and ventrad of the genu of the corpus callosum lie one or two fissures, more or less parallel to the mesorbital bor
Size: 2064px × 1211px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
