976 



CORPUS STRIATUM. 



[BOOK in. 



number of sections of a hemisphere taken in different planes must 

 be studied ; and these will at the same time explain why the nucleus 

 is called 'caudatus.' These teach us that the nucleus has somewhat 

 the form of a comma (Fig. 119). The thick rounded head forms 

 the lateral wall of the front part of the lateral ventricle ; thence 

 the body passes backward narrowing rapidly and diverging some- 

 what laterally ; in its course it arches over the nucleus lenticularis, 

 curving so much that the end of the tail sweeping round the hinder 

 border of that body and changing its direction runs eventually 

 ventral to it. In a horizontal section taken at a certain depth 

 such as that represented in Fig. 115 only a portion of the head or 

 body (Nc) in the front part of the figure, and a transverse section 

 of the end of the tail (-Z\ r c) in the hind part of the figure are seen ; 

 all the intervening portion of the nucleus lies above the plane of 



FIG. 118. DIAGRAMMATIC OUTLINE OF A TRANSVEESE DORSOVENTRAL SECTION OF 

 EIGHT HEMISPHERE (MAN) THROUGH THE FRONTAL LOBE. (Natural size.) 

 (Sherrington.) 



Nc. Head of nucleus caudatus, and Nl. the front end of the putamen of the nucleus 

 lenticularis becoming fused with it. c. c. corpus callosurn, cut through at its 

 front bend or rostrum so that both dorsal and ventral portions are shewn \ 

 between these is seen the fifth ventricle or cavity in the septum lucidum SI. 

 Iv. lateral ventricle. Cl. claustrurn. F. Frontal lobe. 



Cortical grey matter, as in Fig. 117, left unshaded. 



