46 Encephahe Anatomy of the Races 
brum. ‘'Transversely directed ramifications and anastomoses are very 
numerous. In the frontal lobes there is a distinct subdivision into five 
gyral tiers on the left, and four on the right side. 
Viewed dorsally and ventrally, the cerebrum appears wider, and a 
trifle more intricate, in configuration than that of “‘Atana,” resembling 
that of “ Kishu” in many respects. The insule are covered in by the 
opercula. The callosum, 8 cm. in length, on cross-section is seen to be 
quite thick in the splenium and genu, but unusually thin in the body 
of this structure. 
The combined calcarine-postcalearine fissures do not take quite as 
straight a course as noted in “ Atana’s” cerebrum. 
Lert HEMICEREBRUM. 
THE INTERLOBAR FIssuRES.—7he Sylvian Fissure and its Rami.—The 
sylvian fissure is 5.7 cm. in length and quite straight. Its depths are: 
Presylvian depth, 14 mm.; medisylvian depth, 17 mm.; postsylvian depth, 
24 mm. 
The basisylvian, measuring from the temporal pole, is 23 mm. in depth. 
The presylvian is simple, 20 mm. long, and quite deep. The subsylvian is 
also simple and 20 mm. in length. The episylvian is exceedingly short (5 
mm.) while the hyposylvian is absent. 
The Central Fissure—The central fissure is notably tortuous, and when 
measured by a wet string laid in its course attains the length of 11.5 em. 
There are seven distinct curves, two more than usual. One caudal ramus 
closely approaches the subcentral fissure, being separated by a slight 
vadum. Dorsad the fissure reaches the dorsi-mesal margin; ventrad, 
there is a slight, superficial junction with the sylvian cleft by a vessel- 
groove. 
The Occipital Fissure——The occipital fissure is deep. Its mesial length is 
3.5 em., its dorsal length, 2 em. On the mesial surface, near the dorsi- 
mesal margin, there is an appearance of bifurcation. In reality there 
springs from out of the true oecipital a well-marked adoccipital which 
extends upon the dorsum for 2 em., parallel with both the occipital (dorsal 
part) and the cephalic stipe of the paroccipital. This adoccipital is ex- 
ceedingly well marked. Its walls slope cephalo-ventrad, so that one may 
speak of a parietal operculum which partially overlaps a cuneolus. 
The Calcarine Fissure.—The calearine fissure is 3 cm. in length, sends off 
one dorsal ramus and bifureates caudally. These limbs embrace a trans- 
calcarine isthmus, which separates the calearine from a well-marked, 
simple postcalearine (“sulcus extremus ” of Schwalbe). The latter fissure, 
lying almost wholly on the convex surface of the hemicerebrum, is 3 em. 
in length. The general direction of the two fissures is less straight than 
noted in the other hemicerebra. 
The occipito-calearine fissural stem is 2 em. in length, and completely 
confluent with both the occipital and the calearine fissures. 
