NERVOUS TISSUE 



149 



These "end discs" were first observed by Huber in frogs (Anat. Anz. 

 1896, vol. 12, pp. 417-425). They are found not only in spinal ganglia 

 but also in the central nervous system and in sympathetic ganglia; and 



Dorsa root. 



Motor cell of 

 the spinal cord. 



Ventral 

 root. 



Spinal 

 ganglion. 



End disc 



Capsule. 



FIG. 135. DIAGRAM OF THE NERVOUS ELEMENTS IN A HUMAN SPINAL GANGLION. 



after the distal part of a nerve has been cut away, the axis cylinders of the 

 proximal part send out many such buds, which grow into the myelin 

 toward the place of injury. In all cases they are regarded as abortive 



