Prentiss, PeripJieral Netxvorks. 



lOI 



medullated fibers;- these have been observed by Bethe ('95) 

 and are probably identical with the structures described by 

 DoGiEL ('98) and Leontowitsch (:01). For convenience of 

 description a perivascular and subepithelial network will be dis- 

 tinguished. The perivascular network lies deep in the tissues of 

 the palate and extends wherever blood vessels are abundant. 

 Its meshes are large and the cells comparatively few in number 

 except about the arteries ; here a close nework is formed by the 

 fibers and many cells are present (Fig. 4). I have observed 



Fig. 4. A nerve network about the walls of an artery (frog); a medullated 

 fiber is seen to be connected with this network. X 380. 



similar structures in the floor of the mouth, in the upper part of 

 the oesophagus, and in the wall of the intestine. Bethe states 

 that they may be found in all parts of the integument. In 

 many cases medullated fibers may be directly connected with the 

 mesh-work about the arteries. A connection of this kind is 

 shown in figure 4. 



I have never been able to make out special endings in the 

 perivascular networks. The nerve fibrils may often be observed 



