432 



DISEASES OF THE NERVOUS SYSTEM. 

 FIG. 203. 



Diagrammatic representation of the supply of the groups of anterior-horn cells by the 

 radicular branches of the anterior median arteries, showing one group of cells 

 completely destroyed by occlusion of one of these small vessels, and thus ex- 

 plaining why in poliomyelitis there is usually permanent loss of movement in 

 some one or more muscles (F. W. Mott). 



FIG. 204. 



The lesion in the posterior columns at the first dorsal region in a case of locomotor 



ataxia (Starr). 



