52 Encephalic Anatomy of the Races 
and anastomoses with the sub-(post)-central over a slight vadum. The 
hyposylvian is represented by a mere notch. 
The Central Fissure——The central fissure is 11.5 em. in length, has the 
usual five curves and is less tortuous than its fellow on the left side. At 
about 2 cm. from the dorsi-mesal margin, it anastomoses with a small 
fissure in the precentral gyre over a vadum 8 mm. deep. 
The Occipital Fissure-—The occipital fissure is well-marked, deep, with a 
mesial length of 4.5 em., and a dorsal length of 2.5 cm. © 
The Calcarine Fissure—The calecarine fissure is exceedingly tortuous and 
ramified. Its length is 5 em. Caudally it bifureates, and in its course 
sends off three rami. The postcalcarine is triradiate, its two mesial limbs 
embracing the dorsal limb of the furcal calearine. The postcalearine lies 
almost wholly on the convex surface of the hemicerebrum and anasto- 
moses with an exoccipital piece. 
The ocecipito-calearine stem is 2.8 em. in length and sends one ramus 
into the subecalearine gyre. 
FISSURES OF THE FRONTAL LOoBE.—The Precentral Fissural Compler.—The 
supercentral is of a well-formed zygal type anastomosing freely with the 
superfrontal. The precentral is separated from the supercentral, is also 
of zygal shape, and anastomoses with the subfrontal. A depressed isth- 
mus separates the diagonal from both the precentral and the subfrontal. 
The transprecentral springs from the sylvian cleft, but is otherwise inde- 
pendent. 
Communicating with the diagonal over a deep vadum, and dipping deeply 
into the sylvian cleft, there lies an unnamed fissure. 
The superfrontal is divided into two segments in the mid-frontal region 
by a small isthmus. Both pieces are tortuous and ramified. The caudal, 
larger piece communicates with the distinct medifrontal by a transverse 
anastomosis. 
There are two distinct paramesial segments in the superfrontal gyre. 
The medifrontal fissure is in this case exceedingly well marked. It 
may be described as consisting of two, freely-confluent segments, attain- 
ing a total length of 9 em. It has a sigmoid course, and is richly rami- 
fied. It communicates near its middle with the superfrontal and far 
cephalad with the subfrontal by means of what may be a segmental rep- 
resentative of the orbitofrontal fissure. 
The radiate fissure is represented by a short piece. 
Several segments, not very typical, are to be observed in the course of 
what would be the orbitofrontal. 
MESIAL SURFACE.—The supercallosal fissure is distinet for 7 em. in the 
cephalic region, but, as one approaches the paracentral the appearances 
become atypical. The continuity of the fissure is broken by two trans- 
verse isthmuses. As for the paracentral, whether this is the short caudal 
piece so marked in Figure 12, with its cephalic limb ecaudad of the tri- 
radiate piece traversing the dorsi-mesal margin, or whether it is the en- 
tife piece, 4 em. in length with an intraparacentral ramus is a matter of 
doubt. The author inelines to the latter explanation, judging from the 
general relations of neighboring fissures. Tt still remains an important 
