250 



NORMA L HISTOL OGY. 



peripheral ganglion-cells, as is exemplified in many, if not all, of 

 the organs of special sense. 



I. THE SPINAL CORD. 



The axis of the spinal cord is composed of a column of gray 

 matter containing numerous ganglion-cells and nervous filaments 

 held in position by a cement-substance, neuroglia-cells, the fibrous 

 prolongation of the ependyma cells lining the central canal, and a little 

 fibrous tissue accompanying the vessels derived from the pia mater. 



Fig. 233. 



Fig. 234. 



Figs. 233 and 234.— Transverse sections of human spinal cord. (Schiifer.) 

 Fig. 233, from the lower cervical region : Fig. 234, from the middle dorsal region, a, b, c, groups 

 of ganglion-cells in the anterior horn; d, cells of the lateral horn: e, middle group of 

 cells ; /, cells of Clarke's column : g, cells of posterior horn ; c, c, central canal , a, c, an- 

 terior commissure of white matter 



