190 



THE ESSENTIALS OF HISTOLOGY 



The cells are best seen in the spinal cord of animals and in the child ; 

 in the human adult they have frequently become proliferated, and their 

 cilia are 110 longer visible. 



Characters of the spinal cord in the several regions (fig. 225). 

 In the cervical region the white matter, especially that of the lateral 



Sao* 



Sac 2 



D12i. 



C5 



Cl 



FIG. 225. TRANSVERSE SECTIONS OF THE SPINAL CORD AT DIFFERENT LEVELS. 



(Twice the natural size.) 



The letters and numbers indicate the position of each section ; Ca. at level of coccygeal nerve : 

 Sac. 4 of 4th sacral ; L3 of 3rd lumbar, and so on. The grey substance is shaded dark, and 

 the nerve-cells within it are indicated by dots. 



columns, occurs in largest proportion. The grey matter, especially in 

 the cervical enlargement, is in considerable amount (C 5), and it en- 

 croaches in the form of a network upon the adjacent part of the lateral 

 white column. The anterior coriiua are thick and the posterior slender. 

 The posterior median column is distinctly marked off. 



