2 9 6 



APPLIED PHYSIOLOGY 



region recalls another memory of the same object. Thus, 

 when the temporal region recalls the memory of a sound 



of a bell, the occipital 

 region recalls its appear- 

 ance. 



534. Motor regions. - 

 Orders for voluntary mo- 

 tion are sent by the cells 

 lying just in front of a 

 zone connecting the two 

 ears. Each muscle of 

 the body is controlled 

 by a special set of nerve 



cells called 

 center. 



its motor 



A motor impulse passes 

 down through the white mat- 

 ter of the cerebrum, medulla, 

 and spinal cord to the spinal 

 nerve cells, and then out along 

 a motor nerve to a muscle. In 

 y or disease in the top 



an 



the motor region may be in- 

 volved, giving paralysis of cer- 



Diagram of the course of nerve influences 

 in voluntary motions. 



a object to be picked up. 



b sensory nerve. 



c the part of the influence which goes to the 



cells of the cord, and tends to produce of the skull some of the cells of 



reflex action. 

 d cell of spinal cord. 

 e motor nerve from spinal cord. 

 / continuation of the sensory nerve b up the tam "^scles. By tl 



cord to the brain. affected one can often judge 



g cell of the brain which perceives touch. o f t h e exact location 

 h motor cell. , , , 



i thought cell. trouble and rem V 



j motor nerve fiber running to the cells of the operation. 



cord, and carrying an influence which 535. Relation 



continues along the motor nerve e. 

 k muscle which moves the hand. 



of the 

 it by an 



of the 



sensory to the motor re- 

 gions. The motor and sen- 

 sory regions are in close connection by nerve fibers in the white matter. 

 The motor region regulates its impulses according to information brought 



