CEREBRAL LOCALIZATION OF FUNCTIONS. 189 



2. The upper limb area may be subdivided as follows: The upper part 

 controls the movements of the shoulder; posteriorly and below this point 

 are centers for the elbow; below and anteriorly, centers for the wrist and 

 finger movements, while lowest and posteriorly, centers governing the 

 thumb. 



FIG. 27. DIAGRAM OF THE MOTOR AREAS ON THE OUTER SURFACE OF A MONKEY'S 

 BRAIN. (Horsley and Schdfer.) 



FIG. 28. DIAGRAM OF THE MOTOR AREAS ON THE MARGINAL CONVOLUTION OP A 

 MONKEY'S BRAIN. (Horsley and Schdfer.) 



3. The leg area may be subdivided as follows: The anterior part, both 

 on the mesial and lateral surfaces, contains centers governing the hip and 

 thigh movements; in the posterior part are centers for the movements of 

 the leg and toes. The center for the great toe has been located in the 

 para central lobule. 



