410 THE NERVOUS SYSTEM 



originate from these central system cells and connect them 

 with more or less distant parts of the body. Many of 

 the axones found in the white matter of the cord and 

 brain, however, never leave the central system, and the 

 function of these is to cormect the brain cells with the 

 cells of the cord or with those of other parts of the brain. 

 In general, then, the gi-ay matter of the central system 

 consists mainly of nerve cells, while the white matter is 

 largely composed of nerve fibers. Each cell gives out from 

 one to several axones, and the entire nervous system may 

 be thought of as very comphcated network of inter- 

 connected neura. 



