ANATOMY AND PHYSIOLOGY OF NERVOUS SYSTEM. 



653 



The Claustrum. To the corpora striata is attached a thin layer 

 of gray substance, so placed that it occupies the field between the 

 lenticular nucleus and the island of Reil. This band, derived from 

 the cortex in a manner similar to those fibers of the corpora striata 

 just mentioned, is the daustrum. It is separated from the external 



Fig. 260. Ideal Horizontal Section Through the Right Hemisphere and 

 Basal Ganglia. (WALLER, after CHARCOT.) 



To illustrate the position of the internal capsule taken in transverse section; 

 HAL indicate the situations in the internal capsule of fibers governing the 

 movements of the head, arm, and leg respectively. 



1, Caudate nucleus. 2, Frontal. 3, Genu. 4, Temporo-occipital. 5, Optic 

 thalamus. 6, Hippocampus. 7, Lenticular nucleus. 



surface of the lenticular nucleus by a band of white substance: the 

 external capsule. 



The claustrum is composed of spindle cells, quite like those 

 found in the deep layer of the cortex. The claustrum should be con- 

 sidered as a part of the cortex that has been detached by reason of 

 the passage of a bundle of fibers of association. These fibers unite 

 the various convolutions among themselves. 



