74 6 



A MANUAL OF PHYSIOLOGY 



case of those which ordinarily act alone. Thus the muscles 

 of respiration and the muscles of the trunk in general are, 

 although perhaps weakened, never completely paralyzed. 



FIG. 269. CEREBRAL CORTEX (MAN) SEEN FROM ABOVE. 



The front of the brain is towards the right. The dotted line shows the position of 

 the fissure of Rolando, as fixed by Thane's rule (p. 748). 



This is an indication that each member of such functional 

 pairs of muscles is innervated from both hemispheres ; and 



FIG. 270.- -MOTOR AND SENSORY AREAS OF MESIAL SURFACE OF HUMAN 



BRAIN. 



The front of the brain is towards the right. The words 'smell and taste' are 

 wrongly placed in the figure. They should be placed just behind the Sylvian fissure 

 instead of in front of it. The location of ' common and tactile sensation ' in the gyrus 

 fornicatus is purely hypothetical. 



this physiological deduction is supported by the anatomical 

 fact already referred to, that after removal of the motor 



