230 



Physiology. 



The Center of Sensations itself Insensible. All sensation 

 seems to be in the gray matter of the convolutions of the 

 cerebrum, and yet it is itself insensible ; it may be cut and 

 cause no sensation. But when the nerve impulses from the 

 various parts of the body reach the gray matter of the cere- 



sight 



-Spinal Cord 

 - 1st Spinal Nerve 

 2d Spinal Nerve 



Fig. 92. The Cranial Nerves and Sense Organs. 



brum they rouse the cells here to an activity that gives us 

 what we call sensation. It is never a sensation until it 

 reaches this part and is properly interpreted. 



Crossed Control of the Body. While each hemisphere 

 mainly controls the muscles of the opposite half of the 

 body, it also, in part, has control of its own side. Paralysis 



