96 



NERVE 



[Gil. VII. 



ship with the involuntary muscular fibres ; though some histologists 

 have stated that they end in the nuclei of the muscular fibres, it is 

 now believed that they do not pass into their interior. 



FIG. 125. From a preparation of the nerve-termination in the muscular fibres of .1 snake, a, End- 

 plate seen in surface view, b, End-plate seen in profile. (Lingard and Klein.) 



The terminations of sensory nerves are in some cases plexuses, 

 in others special end organs. We shall deal with these in our study 

 of sensation. 



in. 12(5. Termination of medullated 

 nerve-tibres in tendon near the mus- 

 cular insertion. (Golgi.) 



FIG. 127. One of the reticulated eud-plates 

 of fig. 126, more highly magnified, a, 

 medullated nerve-fibres ; b, reticulated 

 end-plates. (Golgi.) 



Development of Nerve-fibres. 



A nerve-fibre is primarily an out-growth from a nerve-cell, as is 

 shown in the accompanying diagram. A nerve-cell, though it may 

 have many branches, only gives off one process which becomes the 

 axis cylinder of a nerve-fibre. This acquires a medullary sheath 

 when it passes into the white matter of the brain or spinal cord, and 



