386 Journal of Comparative Neurology. 



or their collaterals, according to Dogiel, pass through the rami 

 communicantes, to the spinal ganglia and end, as described by 

 Aronson (i) and Cajal (7) in pericellular plexuses about the 

 spinal ganglion cells. The dendrites of these type II cells are 

 described as long, slender and branching, difficult to distinguish 

 fronm neuraxes and, according to Dogiel (12), they may be 

 traced, either through the nerve trunks or in an independent 

 course through the circular muscular coat, into the submucosa 

 and mucosa. He, basing his assumption on the work of Sakus- 

 sef (37), who believed he could trace these dendrites, in the 

 intestine of the fish, through a subepithelial plexus into the epi- 

 thelium, says: " Es ist moglich dass die Endverzweigungen 

 dieser Fortsatze in den inneren Organen ebensolche sensible 

 Apparate bilden, wie die sensiblen Fasern des Cerebro-spinal- 

 systems in der Haut, etc." This would, if verified, form a 

 complete apparatus for peripheral sympathetic reflexes. 



In the periphery of these ganglia and along the nerve 

 trunks, as well as in the mucosa and submucosa, are seen many 

 branched cells, with long, slender, nerve like processes, which 

 stain readily in methylene blue and in some respects resemble 

 nerve cells. These seem to correspond to the cells described 

 by Ramon y Cajal (4, 5) as nerve cells, which Dogiel (11) has 

 demonstrated in the adventitia of arteries, in the sheaths of 

 nerves and ganglia and in the connective tissue between the 

 bundles of smooth muscle fibers. While their processes often 

 resemble the processes of nerve cells and may even seem at 

 times to be in communication with nerve fibers, these seem to 

 be cells of connective tissue origin rather than nerve cells. 



Many of the cell bodies of the sympathetic neurones of 

 type I of the intermuscular plexus of the CEsophagus are sur- 

 rounded by pericellular end-baskets, the telodendria of small 

 medullated fibers, found in the nerve trunks and sending collat- 

 eral branches to several ganglia before finally terminating. In 

 any ganglion, one or two or three of these fine fibers may be 

 seen, which often lose their medullary sheaths some time before 

 terminating ; they often branch several times in the ganglion, 

 so that a single fiber may influence, through its collateral 



