152 



PHYSIOLOGY OF NERVE 



[CH. XIV. 



Cajal, by the help of his new silver method, has come to the 

 conclusion that the new formation of nerve axons in the peripheral 

 stump is exclusively due to growth from the central end. He 



G 



F 



FIG. 155. Olive-shaped swellings at the ends 

 of nerve-fibres growing distal wards from 

 the central ends twenty-one days after the 

 nerve had been divided. (Marinesco.) 



Fro. 156. Spiral forms often seen 

 in regenerating nerve-fibres : 

 the fibres are seen to be of 

 varying thickness, and each 

 is provided with a terminal 

 swelling. (Marinesco.) 



figures the long and often contorted course of these growing fibres in 

 the swelling at the cut central end, and shows that they ultimately 

 reach their goal the peripheral segment in time and in spite of all 

 hindrances. The greater the obstacles interposed the later does the 



