364 



ELECTRO-PHYSIOLOGY 



CHAP. 



their turn divide repeatedly (dichotomously), or give off lateral 

 branches ; and finally, after losing the medullary sheath, form two 

 horned bundles of non-medullated, pale fibres, the final ending of 

 which in the substance of the plate can hardly be detected (Fig. 

 233). Not only the dichotomous branches of the medullated, 

 but in part those of the non-medullated terminal arborisations 

 also, are invested with a sheath of connective tissue with em- 

 bedded nuclei, which is more particularly developed in the former. 



FIG. 233. Arborisation jf nerves on the ventral surface of an electrical plate o Torpedo. 



j(Ranvier.) 



According to Kanvier, this sheath ends suddenly at a given point 

 of the non-medullated terminal expansion. 



Remak, 1856 (27), was the first to observe that the fine 

 non-medullated terminal branches can be followed much farther 

 than is described by Wagner. In good preparations the whole 

 of .the apparently empty intermediate spaces proved to be filled 

 with pale and visibly anastomosing nerve-branches. Kolliker, 

 1857 (16 b\ and later on M. Schultze, described a true nervous 

 network, which Schultze represents as a very fine reticulum 



