74 LABORATORY METHODS OF 



the nerve cells have a large number of processes, and 

 one of these functions as an axis cylinder. In both 

 cases the neurilemma corresponds to a cell membrane. 

 A medullated fiber is a fiber with a medullary sheath, 

 and a non-medullated fiber is a fiber without a medul- 



T. S. SPINAL CORD. 



Showing investing membranes and distribution of blood 

 vessels in the white and gray substances. 



lary sheath. The nerves end in the muscle tissue by 

 expanding into a small plate of nerve fiber. There are 

 two main divisions of nerves, viz. : central and sympa- 

 thetic nerves. We will study each of these in detail, 



