THE NEURON 



rently with the aid of these nuclei, a new nerve-fiber may under 

 favorable conditions grow out from the central stump of the cut 

 nerve, and finally the entire nerve may regenerate. In the cen- 



lii 



Fig. 12. Cell from the ventral gray column of the human spinal cord, 

 illustrating the arrangement of the neurofibrils: ax, Axon; Hi, interfibril- 

 lar spaces occupied by chromophilic substance; n, nucleus; x, neurofibrils 

 passing from one dendrite to another; y, similar neurofibrils passing through 

 the body of the cell. (After Bethe, from Heidenhain's Plasma und Zelle). 



tral nervous system, where the neurilemma is absent or greatly 

 reduced, the regeneration of such injured nerves takes place 

 with great difficulty, if at all. 



