1 66 Journal of Comparative Neurology. 



endings in the tendons of the hippocamp (sea horse), torpedo, 

 frog, lizard, tortoise, bird and mammal. 



In the hippocamp he finds free endings, composed of 

 branched or unbranched axis cylinders, having many small 

 nuclei, some of these being mere granules and others large, 

 round or oval nuclei. According to the number of nuclei, the 

 length of the pedicles and the length of the axis cylinders, the 

 whole plaque resembles a bush, a tuft, or rarely a star-like small 

 plaque. Pansini considers these morphologically equivalent to 

 motor endings. 



For the torpedo, he describes a rich plexus with large, 

 irregular meshes, in which are found plaques consisting of med- 

 ullated fibers, which branch and rebranch and finally become 

 non-medullated and have many round or oval nuclei attached, 

 some small and granular, others larger and having nucleoli. 

 Three classes of endings are described — one free ; one larger 

 and surrounded by a thin membrane ; the third surrounded by 

 a definite capsule. 



In the frog and lizard, he used the tendo Achillis and the 

 tendons of the small muscles of the foot. The nerve ending 

 consists of a fine delicate reticulum at the nodal points of which 

 are granular nuclei, some showing nucleoli. The endings are 

 free in the frog and generally in the lizard, but in some cases in 

 the lizard, the sheath of Henle of the nerve innervating the 

 organ forms a sort of investing capsule. In the lizard, also, 

 the network is more complicated, the plaques larger and the 

 nuclei more numerous, with more of those that have nucleoli. 

 In the tendo Achillis of the turtle are found the beginnings of 

 true neuro-tendinous organs of Golgi. Two to five plaques like 

 those described for the frog and the lizard, are grouped into a 

 quite definite organ, surrounded by one or several layers of 

 connective tissue — elementary neuro tendinous organs. These 

 plaques are arranged on tendon fasciculi, whose elements are 

 smaller and more numerous than those of the surrounding tendon. 

 The fusiform enlargements found in connection with the nerves 

 supplying tendon, and mentioned by Golgi, Cattaneo and Mar- 



