1865.] Of the Nerve-tufts, Nervenhugel, $c. 247 



as respects the nature of the Nervenhugel, we are at variance upon the 

 further course and mode of termination of the nerve-fibre, M. Rouget 

 maintaining that it penetrates beneath the sarcolemma and there terminates 

 in a very fine fibre, in contact with a very limited portion of the contractile 

 tissue, while I have been able to trace the nerve for a long distance beyond 

 the point at which he makes it end, and I have seen it dividing into very 

 fine fibres, which form an extended network upon the sarcolemma, as repre- 

 sented in this drawing, to which I beg to direct special attention. M. 

 Rouget' s researches lead him to conclude that the arrangement of the nerves 

 in the muscles of Articulata is totally distinct from that met with in Verte- 

 brata. " II result de ces faits qu'il n'y a pas d'identite entre les divers modes 

 de terminaison des fibres nerveuses motrices chez les vertebres et les 

 articules." On the other hand, my observations lead me to the conclusion 

 that the arrangement is in its essential points the same in all classes of 

 animals. In no case are there nerve-ends, but always plexuses or networks, 

 which are never in structural continuity with the contractile tissue of the 

 muscle. 



I have particularly studied the arrangement and distribution of the 

 nerves in the leech. The same facts noticed in p. 258 on the branching of 

 nerve-fibres, are observed in the nerves of this animal ; and I have been able 

 to obtain many specimens of nerves which could hardly be distinguished 

 from some of the finest dark-bordered fibres of the higher animals. Some 

 of the muscular fibres of this animal are very thin, and are separated from 

 one another by considerable intervals, in which the ramification of exceed- 

 ingly delicate nerve-fibres can be readily detected, and the nerve-fibres can 

 be followed to their connexion with ganglion-cells. I have made many 

 specimens of the muscles of the leech, and taken several drawings to illus- 

 trate these points, but I regret that I am unable to have these copied for 

 this memoir. 



Of the structure of the bodies termed nerve-tufts, nerve-eminences, and 

 Nervenhugel, seen in connexion with certain muscular nerves. 



I propose now to consider the structure of the peculiar bodies in con- 

 nexion with the nervesdistributed to the muscles of certain animals, described 

 by Kiihne, Rouget, Krause, and others. These differ from the bodies first 

 studied by Kolliker in the breast-muscle of the frog, which are referred 

 to in p. 261. I have never been able to demonstrate such bodies as I am 

 about to describe in the muscles of animals generally, although they are ex- 

 ceedingly distinct in the muscles of lizards, as shown by Rouget. I have 

 demonstrated many in the cutaneous muscles of the neck, and in the 

 muscles of the tongue of the chameleon, and shall carefully consider the 

 structure of these. 



In the first place, I would remark that these bodies are external to the 

 sarcolemma, as may be proved by examination of the specimens. The 

 course of the nerves to and from these bodies almost renders it impossible 



