504 



COMPARATIVE PHYSIOLOGY. 



FUNCTIONS OF OTHER PORTIONS OF THE BRAIN. 



Certain parts of tlie encephalon are spoken of as the basal 

 ganglia, prominent among which are the corpus striatum and 

 the optic thalamus. 



The Corpus Striatum and the Optic Thalamus.— The corpus 

 striatum consists of several parts, the main divisions being an 

 intra-ventricular portion or caudate nucleus, and an extra-ven- 

 tricular part or lenticular nucleus. 



Fig. 361. — Transverse section of cerebral hemispheres of man at level of cerebral gan- 

 glia (after Dalton). 1, great longitadinal fissure; S, part of same between occipital 

 lobes; 3, anterior part of corpus callosum; 4, fissure of Sylvius; 5, convolutions 

 of Island of Beil (insula); 6, caudate nucleus of corpus striatum; 7, lenticular nu- 

 cleus of corpus striatum; 8, optic thalamus; 9, internal capsule; 10, external cap- 

 sule; 11, claustrum. , 



