430 



THE INTERNAL STRUCTURE 



that met with in the higher Apes, in whom the 

 previously much-talked of ' posterior cornua ' exist, as 

 well as the small swelling (' hippocampus minor ') on its 



inner side, which corres- 

 ponds externally with the 

 calcarine sulcus (see p. 

 304). The Corpora Quad- 

 rigemina and adjacent 

 structures also present 

 no distinct peculiarities. 

 As there are no fresh 

 structures met with in 

 these regions of the Hu- 

 man Brain, no special 

 description of its internal 

 topography is needed, 

 other than what is to be 

 gathered from figs. 151 



FIG. 151.-The Lateral Ventricles and their - - q -ft f i PXT) l aria . 



Cornua, with Contiguous Structures. (After 1Drf > Wltj 



Sharpey.) The upper portions of the Hemi- tionS. These the reader 

 spheres have been cut away; the Fornix (c) ^ .. 



has been rut across and reflected, so as to Will do Well to Study, and 



show the' velum interpositum ' (d d) and the compare ^Hk figures of 

 great veins of Galen which convey blood away f " 



from the central parts of the Brain, including the Same parts belonging 



the Corpora Stri.ata (6) ; a, e. q, are the three . n , -i i 



cornua of the Ventricles ;>; Hippocampus tO SOme of the lower 



major (to show which thebrain substance has animals (figS. 86, 87. 115). 



been cut away still more on the right side) ; JIM 



h, Hippocampus minor. Some 16 W details COH- 



cerning the structure of 



the Corpora Striata and Thalami will moreover be found 

 in the next section. 



2. The Distribution ol the Fibres Composing the 

 Cerebral Peduncles. 



Serious attempts have been made during recent years 

 to unravel the precise course of the different bands of 



