596 



TEXT-BOOK OF PHYSIOLOGY 



Bilateral Representation. Though highly specialized movements 

 such as those performed by the arms and hands, legs and feet, have thei: 

 areas of representation on one side of the cerebrum only, and that oppositi 

 to the side of the movement, less highly specialized movements, such as thi 

 masticatory, phonatory, respiratory and various trunk movements, whicl 

 require for their performance the cooperation of muscles on both sides o 



Motor and tactile area. 



Parietal association area 



Island of Reil. 



Occipito-temporal 

 association area. 



Auditory area. 

 Motor and tactile area. 



Parietal association area 

 (Precuneus). 



Visual area 

 (cuneus) . 



Frontal 



association 



area. 



Occipito-temporal 

 association area. 



Olfactory lobe. 

 Olfactory tract. 



Olfactory area. 



Gyrus hippocampus. 



FIG. 254. DIAGRAMS TO SHOW THE POSITION AND THE RELATION OF THE ASSOCIATION AND 

 PROJECTION AREAS. THE PROJECTION AREAS ARE DOTTED. (After Flechsig.) 



the body, have their areas of representation on both sides of the cerebrum; 

 the area of either side exciting to action the muscles on both sides of the 

 body. In the case of specialized movements the representation is unilat- 

 eral; in the case of the more general movements the representation is 

 bilateral. 



Association Centers. The sensor and motor areas to which specific 

 functions have been assigned do not constitute more than one-third of the 



