CHAP, ii.] 



THE BRAIN. 



97 



the section. In a transverse, dorso-ventral, section taken somewhat 

 anteriorly through the front limb of the capsule, Fig. 117, the 

 head or body of the nucleus caudatus (Nc), which has not yet 

 reached its greatest dimensions, is seen lying dorsal to the 

 nucleus lenticularis, separated from it by the white mass of the 

 front limb (da) of the capsule, though this is somewhat broken 

 up by strands of grey matter passing from one nucleus to the 

 other. In a transverse, dorso-ventral section, taken still more 

 anteriorly, through the frontal lobe (Fig. 118), the head of the 

 nucleus caudatus is seen at about its greatest size, and the 

 diminishing nucleus lenticularis (Nl), represented by the putamen 

 alone, is becoming fused with it, the two nuclei being separated 

 by a small quantity of white matter of the internal capsule and 

 that largely broken up by bridles of grey matter, giving rise to a 

 striated appearance. In a similar section still farther forward, the 

 nucleus lenticularis would be absent, the head of the nucleus 

 caudatus appearing by itself. Returning to the hinder part of 

 the hemisphere, we find in a dorso-ventral section taken through 



FIG. 119. DIAGRAMMATIC OUTLINE OF A SAGITTAL SECTION TAKEN THROUGH THE 

 BIGHT HEMISPHERE (MAN) SEEN FROM THE MESIAL SURFACE. (Half Natural 

 size.) (Sherrington.) 



The plane of the section is not truly sagittal, but slightly inclined. 



Nc, the caudate nucleus exposed, to the left of the letters Nc in nearly its entire 

 anterior extent, to right of the letters in a considerable part of its posterior 

 extent. It forms an arch of grey matter over the grey matter of Pt the 

 putamen and Gp the globus pallidus of the lenticular nucleus. Mi, the 

 amygdaloid nucleus. Ci, Ci, Ci, the internal capsule; Ca, the anterior 

 commissure; cc, the hinder limit of fibres of the splenium corporis callosi. 

 P. the parietal lobe; T. the temporal. 



622 



