THE MUSCLES. 



537 



sists of a mass of protoplasm (sarcoplasm) containing granules and 

 nuclei. Beneath the sarcolemma the original nerve-fiber is broken 

 up into a number of divisions, spoken of as nerve-endings. These 

 are divisions of the axis-cylinder which are spread over the sarcous 

 substance without piercing it. To this branched arrangement of 

 the nerve-endings Kiihne gave the name motor spray. 



Fig. 189. Unstriped Muscular Tissue. ( ELLENBEBGER. ) 



A and B, Foetal cells. C, H, Fully formed fiber. I, Bundle of fibers. 

 K, Cross-section of bundle of pale muscular fibers. 



The nerve-endings are thus confined to very small areas on the 

 scle-fibers which have been termed by the same author fields of 

 Cation. As a rule, each muscle-fiber has but one such area; it 

 the exception to find more than one, but as many as eight have 

 n found in very long fibers. 



Sensory fibers are also found in muscles, for it is through their 

 ence that we obtain muscle sensibility. They seem to be dis- 



