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 fiesh 

 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 he 

 gathered from figs. 151— 

 153, with their explana- 

 tions. These the reader 

 will do well to study, and 

 compare with figures of 

 the same parts helonging 

 to some of the lower 

 animals(figs. 86,87,115). 

 Some few details con- 

 cerning the structure of 

 the Corpora Striata and Thalami will moreover he found 

 in the next section. 



Fig. 151.— The Lateral Ventricles and their 

 Cornua, with Contiguous Structures. (After 

 Sharpcy.) The upper portions of the Hemi- 

 spheres have been cut away ; the Fornix (c) 

 has been cut across and reflected, so as to 

 show the 'velum interpositum ' (d d) and the 

 great veins of Galen which convey blood away 

 from the central parts of tbe Brain, including 

 the Corpora Striata (6) ; a, e, ff, are the three 

 cornua of the Ventricles ; /, Hippocampus 

 major (to show which the brain substance has 

 been cut away still more on the right side) ; 

 h, Hippocampus minor. 



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 



