THE CENTRAL NERVOUS SYSTEM 745 



joints thus, in the leg area, the hip, knee, and ankle joints, 

 and the great toe, are represented by separate and special 

 centres ; (2) that stimulation of any one of these areas leads, 

 not to contraction of individual muscles, but to contraction 



]SURE OF ROLANDO 



SYLVIA M 

 FISSURE 



FIG. 268. LATERAL VIEW OF LEFT HEMISPHERE (MAN), WITH MOTOR AND 

 SENSORY AREAS. 



The front of the brain is towards the left. 



of muscular groups which have to do with the execution of 

 definite movements. 



Removal of the whole of the motor cortex of one hemi- 

 sphere causes paralysis of movement on the opposite side 

 of the body. The paralysis is less marked in the case of 

 bilateral muscles that habitually act together than in the 



