226 THE NERVOUS SYSTEM 



number of nuclei, and sends off from its under surface fine 

 fibrillae which are said to pass between the muscular fibrillse 

 which make up the fiber. Sensory fibers are somewhat 

 scantily distributed to the voluntary muscles. 



In plain muscle tissue the motor nerves are distributed 

 after the same general manner as in the striped muscles, 



Nerve-fibre. 



End-plate. 



Muscle nucleus. 



FIG. 69. Termination of a nerve fiber in end-plate of a lizard's 

 muscle. (Stirling.) 



though with some differences. Here the fibers are not me- 

 dullated, and primitive fibrils passing from the intermediary 

 plexus finally enter the nuclei of the muscle cells. 



Medullated fibers have been traced to the cells of glands, 

 but not farther. It is thought by some that, having formed 

 a plexus, non-medullated fibers pass in to terminate in the 

 nucleoli of the gland cells, though such endings have not 

 been demonstrated. 



The peripheral distribution of nerves connected with the 

 special senses will be discussed elsewhere. 



The remaining methods of termination above noted apply 

 to afferent nerves. It is claimed that a very large number of 

 sensory nerves terminate in hair-follicles. If such be the 

 case it will account for sensory terminations in by far the 

 greater part of the cutaneous surface. It is supposed that 



