THE HIGHER ORGANISMS 



127 



Neuraxis 



Medullary sheath 



Nucleus of 

 neuri lemma 



Dendrite 



Collateral branch 

 Neurilemma 



Node of Ranvier 



Internodal 

 segment 



Axis-cylinder of 

 medullated 

 nerve-fiber 



Motor ending 



Muscle-fibers 



FIG. 45. Diagram of peripheral motor neurone, showing the specialized 

 contractile tissue, the muscle, the specialized conducting tissue, the nerve fibre, 

 with the motor endings in the muscle, and the source of the stimulation, the 

 nerve cell. (Bohm, Davidoff and Huber.) 



