STUDY OF BRATNS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 289 



massive and broad in its caudal part ; the cephalic part is reduced and cut off by the 

 occipital-paroccipital anastomosis. 



The various regions of the subparietal lobule, including the marginal, angular and 

 postparietal gyres, while exhibiting a good degree of development, are of smaller extent 

 than on the left side. Their lesser massiveness has been noted above in the description 

 of the norma dorsalis. 



Mesial Surface. — The right precuneus is likewise unusually small, attaining a 

 width of only 2.7 cm. (measuring between the caudal limb of the paracentral and the 

 occipital fissure). Its general appearance resembles that of the left very well. The 

 cuneus too is of similar size and shape and the remarks concerning the distance of the 

 "wedge" from the callosum apply to this side as well. The occipito-calcarine junc- 

 tion takes place 2.7 cm. from the dorsi-mesal margin, and 2.4 cm. from the caudal 

 edge of the splenium, practically identical with the distances on the left side. As on 

 the left, the hippocampal gyre l)ecomes extremely narrowed by the close approach of 

 the occipito-calcarine stem to the hippocampal fissure. 



Fissures of the Temporal Lobe (Latero-ventral Surface). — The supertem- 

 poral fissure is on this side more regular in its course and is shorter, being 13.5 cm. in 

 length. It bifurcates caudally, embracing the second intermedial {itml") between its 

 limbs. It anastomoses with the sylvian as well as with the meditemporal segment. 

 The meditemporal is represented by two irregularly ramifying segments, of which the 

 caudal one anastomoses with the subtemporal. The latter fissure is of I'ather unusual 

 extent, referring especially to the caudal piece which extends far caudad, and fuses 

 with the lateral arm of the collateral, and combined with the latter almost reaches the 

 calcarine fissure near the occipital pole. The cephalic subtemporal segment is of 

 quadri-radiate type and also anastomoses laterally with the collateral. 



The collateral attains a maximum length of II cm. It bifurcates caudally, anas- 

 tomoses with the subtemporal as described above, and also with the occipito-calcarine 

 fissural stem. The amygdaline is merely indicated by a shallow furrow which passes 

 out of the basisylvian. 



Gyres OF the Temporal Lobe. — Compared with that of the left, the right super- 

 temporal gyre is a trifle wider and of much more uniform shape. The same may be 

 said of the remaining gyres ; they are generally less complex than on the left. 



The Insula. — The right insula is smaller than the left and presents only five 

 peri-insular digitations, there being one postinsular and four preinsular gyres. (See 

 Fig. 9.) 



