CHAP. XVIII.] THE NERVOUS SYSTEM. 



217 



axis-cylinder also disappears. In regeneration, the new fibres grow afresh 

 from the axis-cylinders of the central end of the severed nerve-trunk, and, 

 penetrating into the peripheral end of the trunk, grow along this as the 

 axis-cylinders of the new nerve, each axis-cylinder becoming after a time 



FIG. 127. -END-BULBS FROM THE HUMAN CONJUNCTIVA. (Longworth.) A, 

 ramification of nerve-fibres in the mucous membrane, and their termination in end- 

 bulbs, as seen with a lens ; B, an end-bulb more highly magnified ; a, nucleated cap- 

 sule ; 6, core ; c, entering fibre branching, and its two divisions passing to terminate 

 in the core at d ; C, an end-bulb treated with osmic acid, showing the cells of the 

 core better than B. 



surrounded with a medullary sheath. Restoration of function in the nerve 

 may not occur for several months, during which time it is presumed the new 

 nerve-fibres are slowly finding their way along the course of those which 

 have been destroyed. 



