THE CEREBELLUM 



313 



activities based upon mental pursuits and the acts or states of 

 mind connected with them. 



Clinical notes. These several localizations furnish a guide to the under- 

 standing of various disturbances of the nerve system, since irritation of a 

 given area may cause disordered muscle action in the part which it controls, 

 or, by pressure (as in hemorrhage or apoplexy) the power of motion may be 

 lost (paralysis). The same symptoms may follow softening of the cerebral 

 tissue, the growth of tumors, etc. By carefully observing the condition of 

 the muscles affected, one can often determine the location of a brain lesion. 

 Disturbances of hearing, vision, sensation, etc., likewise indicate the seat of 

 disease or injury. 



FIBRM PROPRIJE 



SUPERIOR LONGITUD- 

 INAL FASCICULUS 

 STRIA TERMINALS 

 OF THALAMUS 



CINGULUX 



UXCINATE 

 FASCICULUS 



INFERIOR LONGITUDINAL FASCICULUS 



FIG. 201. ASSOCIATION FIBERS. (Morris?) 



The function of the cerebellum is to associate or coordinate 

 the actions of muscle-groups for the accurate performance of 

 special movements. This is most conspicuously shown in 

 maintaining the equilibrium of the body, whether standing or 

 walking. Injury to the cerebellum results therefore in vertigo 

 and dizziness, in loss of the power to keep one's balance, and of the 

 ability to walk without staggering. 



The medulla oblongata contains many important governing 

 centers. Among them are the circulatory and the respiratory 

 centers; these are situated near each other and together they 



