94 ANATOMY FOR NURSES. [Chap. VIL 



The cerebellum is a great coordinating centre for impulses 

 passing from the cerebral cortex to the voluntary muscles. 



The cerebral cortex is involved in all conscious perceptions 

 or sensations, in memory, and in the voluntary movements. 

 Different parts of the cortex have been shown to have different 

 functions. Thus there are areas for visual and auditory sensa- 

 tions ; areas which control the voluntary movements of various 

 parts of the body, — the leg, the arm, the hand, etc., each having 

 its separate area.^ There is also a well-defined " speech centre." 



1 All the fibres passing to and from the cortex cross over to the other side of 

 the body, so that an injury to one side of the brain causes paralysis of the oppo- 

 site side of the body. 



