S,L- 



-ax. 



FIG. 133. DIAGRAM OF A NEURON. 



a h, axon hillock; a x, axon; c, cytoplasm, the Nissl granules have been stained; 

 d, dendrons; m, myelin sheath of the nerve fiber; m', muscle fiber; n, nucleus; n', 

 nucleolus; n of >i, nucleus of the neurolemmaof the nerve fiber; n R, node of Ran- 

 vier; s /, collateral; s L, segment of Lantermann; tel, telodendrion or terminal 

 arborization which here forms a motor end-plate. (After Barker.) 



120 



