204 



TWENTIETH LECTURE. 



proportion between the number of the nerve and muscular 

 filaments is accordingly very much less. 



In regard to the termination, the lower vertebrates present 

 a different condition from that of the higher. The termina- 

 tion takes place regularly, however, in the interior of the 

 muscular filament, beneath its sarcolemma. We consider 

 only the mammalial muscle (Fig. 178). 



<r 



Fig. 178. — Two muscular filaments from the psoas of the Guinea-pig, with the nerve terminations ; 

 a, b, the primitive fibres and their continuation into the two terminal plates c./\ c, neurilemma 

 with nuclei, d, d, and passing over into the sarcolemma, g, g\ k, muscular nuclei. 



The nerve fibre {a, b), surrounded by an expanding nucle- 

 ated primitive sheath (c, d), here passes to the muscular fila- 

 ment. Its neurilemma becomes the sarcolemma (g). Beneath 

 the latter, at the place of entrance, appears a nucleated, deli- 

 cate molecular substance, a rounded or oval bent plate with 

 nuclei (e,f), concave within, convex without. This (occur- 

 ring only single in the mammalial muscle, and more towards 

 the middle) is the terminal plate of Krause, Rouget and Engel- 

 mann, or the nerve-mound of Kuehne. At f, we have the 



