582 



NERVOUS SYSTEM. 



of the cells, the others probably passing upward to be connected with cells in the 

 encephalon. 



Tracing the prolongations from the cells, we find that one or more of the poles branch 

 and subdivide in the gray substance and give origin to fibres, but that these fibres do 

 not branch after they pass into the white substance. Other poles connect the nerve-cells 

 with each other by commissural fibres of greater or less length ; but it has never been 

 positively demonstrated that the cells are thus connected into separate and distinct- 

 groups, although this is possible. 



The accompanying figure, taken from the excellent monograph on the lumbar enlarge- 



rioroot S 



in every direction. 



a transverse section, from . 



l! co ected ty; long, slender processes with the ante- 

 of cell-connection may be seen, with bundles of fibres crossing 



