6;6 



FUNCTIONS OF THE CEREBRUM. [CH. XLVIII. 



the head, arm, and leg in the order named. More accurately the 

 areas are as follows : 



Head, neck, and face : lower two-thirds of the ascending frontal, 

 bases of the lower and middle transverse frontal, a small piece 



Fig. 502. Right cerebral hemisphere, mesial surface. 



reaching the front of the motor region in the marginal convolution 

 of the mesial surface. 



Upper limb : upper third of the ascending frontal, the base of 

 the upper transverse frontal, the ascending parietal (where the 



Fig. 503. Left cerebral hemisphere, mesial surface. 



centres of hand and wrist are situated), and the piece of the 

 marginal behind the head-centre. 



Lower limb : the parietal lobule, and the posterior part of the 

 marginal. 



Trunk : the marginal between the leg and arm areas. 



The next diagram (fig. 504) shows the relative position of the 

 several motor-tracts in their course from cortex to crus, according 

 to Sir William Gowers. 



