"9^ 



easily discerrjcd. It 



the st 



increa- 



cinereum, the area of attachment of 



cess and the mammillan*" bodies. The 



c cerebral f>eduncles is significant of expansion 



-P^s^ 



FIG. 339A. LEFT LATERAL SURFACE OF BRAIN, HOMO SAPIENS. 



[Actual Length 173 mm.] 



in those great projection systems connected with the cerebral hemispheres. 

 The paUio-ponto-cerebellar tracts, as well as the pyramidal tract, are the 

 constituents of the peduncle. Expansion in these tracts accounts for the 

 increased size of the peduncle. 



Occipital Surface oj Basilar Portion of Hemisphere. The occipital 

 surface of the basilar portion of the hemisphere shows certain equally striking 

 modifications in contour. This is especially notable in that the cerebellar con- 

 cavity, like its cephalic counterpart in the orbital region, has undergone reduc- 

 tion in size and prominence. Only a slight remnant of this depression appears 



