78 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



thick masses of white fibres. They come from the frontal lobe, 

 and contain the corresponding portions of the coronal fibres to 

 the thalamus (thalamic radiations) and the anterior cortical tract 

 to the pons. These fibres must, as you see in the cut, in order 

 to reach the thalamus and the pons, pass through the interposed 

 corpus striatum. The part which remains lying nearer the 



FIG. 46. 



Frontal section through the fore-brain just back of the ascending pillars of the fornix. 



Balkcn, Corpus callosum. 3fitrk!mjer, White substance. 



median line is the nucleus caudatus ; the external part is the 

 nucleus lenticularis. The two are not absolutely and totally 

 divided by these frontal-lobe fibres ; on the contrary, numerous 

 connecting fibres pass between them. The above-named' thala- 

 mic radiations, the anterior cortical tract to the pons, the"' bun- 

 dles passing between the head of the nucleus caudatus and the 



