THE CEREBELLUM. 317 



denominated the internal capsule. The posterior third of the 

 internal capsule is distributed to the posterior part of the 

 hemisphere, and when destroyed produces loss of sensibility 

 on the opposite side of the body. The anterior two-thirds of 

 the internal capsule is distributed to the middle or motor re- 

 gion of the hemisphere, and its destruction causes a paralysis 



N C M R o 



EC ML 



FIG. 145. Modified from Charcot's diagram to show position, relation, and distribution of the inter- 

 nal capsule as seen in a vertical transverse section of the brain on a level with the greatest development 

 of TO, thalamus opticus ; 1C, location of the internal capsule : NL, nucleus lenticularis ; EC, external 

 capsule ; D, claustrum ; NC ; nucleus caudatus ; MRC, motor regions of cortex cerebri ; 1, fibres repre- 

 senting the radiation of the internal capsule vertically to the motor region of the cortex. From "Lec- 

 tures on Localization," by Dr. E. C. Seguin : New York Medical Hecord, p. 142, August 24, 1878. 



of the opposite side of the body. The fibres expanding from 

 the internal capsule, joined by those emanating from the gan- 

 glia at the base and the corpus callosum, form a fan-shaped 

 expansion of white fibres called the corona radiata. 



THE CEREBELLUM. 



The white centre of the cerebellum, formed from the ex- 

 pansion of the peduncular tracts, incloses a collection of gray 

 substance, the corpus dentatum. This body, visible in all 

 sections, bears some resemblance to the olivary body in the 

 medulla, on account of its irregular, dentated outline. Its 

 greater consistence causes it to stand out in a section from the 

 surrounding tissue. In intimate structure this body consists 



