332 NEUROLOGY, OR ANATOMY OF NERVOUS SYSTEM 



Cortical Localization of Function 



Motor Area. Comprises the precentral gyre and parts of 

 the frontal gyres adjacent thereto, together with the para- 

 central, and the adjacent portion of the superf.rontal gyre on 

 its mesal aspect. This area comprises the centres for the 

 muscle control of the following parts of the body located as 

 follows: 



FIG. 55 



Mesal view of left cerebral hemisphere, showing localization of functions. 



Lower limbs. Dorsal part of precentral and paracentral 

 gyres. 



Trunk. Frontad both on the mesal aspect and in the dorsal 

 superfrontal gyre. 



Upper Limb. Midportion of precentral gyre. 



Facial. Ventral part of precentral gyre. 



Tongue, Larynx, Muscles of Mastication, Pharynx. Frontal 

 opercular part. 



Movements of Head and Eye. Medifrontal gyre, adjacent 

 to precentral gyre. 



Owing to a decussation of the pyramidal (motor) tracts 

 in their course to the primary motor centres, the motor centres 



