480 ANIMAL PHYSIOLOGY. 
THE SPINAL CORD.—GENERAL. 
Among the higher vertebrates the spinal cord is found to 
consist of nerve-cells, nerve-fibres, and a delicate connective tis- 
sue binding them together ; while these different structures are 
arranged in definite forms, so that a cross-section anywhere pre- 
sents a characteristic appearance, the more important gangli- 
onic nerve-cells being internal and forming a large part of . 
Fia. 341.General view of nervous system of man (after Mivart), 1, cerebrum ; 2, cerebel- 
lum ; 8, upper part of spinal cord. 
the gray matter of the cord. All the various regions of this 
organ or series of organs are connected with one another, white 
with white and gray matter, as well as white with gray sub- 
