CHAP. IL] THE BKAIN. 975 



But only a part, indeed only a relatively small part, of the 

 nucleus caudatus is disclosed in such a horizontal section ; to learn 

 the somewhat peculiar form and relations of the whole nucleus a 



FIG. 117. DIAGRAMMATIC OUTLINE OF A TRANSVERSE DORSOVENTRAL SECTION THROUGH 

 THE EIGHT HEMISPHERE (MAN) AT A LEVEL ANTERIOR TO FIG. 116. (Natural 

 size. ) (Sherrington.) 



Nc. nucleus caudatus ; Gp', Gp", globus pallidus, seen here in two segments, and 

 Pt. putamen of nucleus lenticularis ; OT. optic thalamus with ca. anterior 

 commissure in close relation to cia, anterior limb of internal capsule. 

 ce. external capsule, op. optic tract, cc. corpus callosum, /. fprnix. Iv. a 

 space that in its upper part belongs to the lateral ventricle, in its lower was 

 filled by the fold of subarachnoid tissue and pia mater the side fringe of which, 

 covered with epithelium, forms the choroid plexus ; this fold was detached in 

 the making of the section and was removed. In. the insula ; F. Frontal lobe ; 

 P. Parietal lobe ; T. Temporal lobe. 



For greater clearness, the cortical grey matter, which is shaded in Fig. 116, is in this 

 figure left unshaded. 



62 



