372 



GENERAL STRUCTURE AND FUNCTIONS 



origin to its termination, and will always have the same character 

 and function in every part of its course. 



The other variety of nervous matter is known as the gray sub- 

 stance. It is sometimes called " cineritious matter," and sometimes 



Fig. 121. 



Inosculation of NERVES. 



Fig. 122. 



"vesicular neurine." It is found in the central parts of the spinal 

 cord, at the base of the brain in isolated masses, and is also spread 



out as a continuous layer on 

 the external portions of the 

 cerebrum and cerebellum. 

 It also constitutes the sub- 

 stance of all the ganglia of 

 the great sympathetic. Ex- 

 amined by the microscope, it 

 consists of vesicles or cells, of 

 various forms and sizes, im- 

 bedded in a grayish, granular, 

 intercellular substance, and 

 containing, also, very fre- 

 quently, granules of grayish 

 pigmentary matter. It is to 

 the presence of this granular 



NERVK CKM.R, intermingled with fibres; from . , . , . , 



M^miUmar ganglion of cat. pigment that thlS kind of 



