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APPLIED PHYSIOLOGY 



lutions increase the surface of the cerebrum, so that in all 

 it measures about four square feet. This greatly increases 

 the area over which the nerve cells in the gray matter may 

 be spread. The interior of the cerebrum is a small irregu- 

 lar cavity, called the ventricle, which is filled with a clear 

 liquid. 



Regions of the head and action of the different parts 

 of the brain. 



530. Regions of the cerebrum. The fissures and con- 

 volutions are nearly the same in all men, and mark out 

 definite regions upon the surface of the brain. First, is 

 the region just behind the forehead, called the frontal 

 region. Second, is the region lying under the upper part 

 of each side of the skull, and called the parietal region. 

 Third, is the region about the ear, called the temporal 

 region. It lies just above and in front of the ear. Fourth, 



