HuBER, Sympathetic Nervous System. 107 



tion of neuraxes of sympathetic neurons, I wish to refer to 

 some observations recently published by Dogiel (71), wherein 

 he states that in sympathetic ganglia two types of sympathetic 

 nerve cells are found. The cells belonging to the first type have 

 been the subject of discussion thus far, and are, according to 

 the ending of their neuraxes, either motor, ending in involuntary 

 or heart muscle ; vaso-motor ending in blood-vessels ; and what 

 we may term secretory nerve fibers, ending on gland cells. The 

 dendrites of such neurons usually end within the respective gan- 

 glion in a manner previously described. 



The cells of the second type are described by Dogiel as 

 follows : — The cell body of such cells is as a rule somewhat 

 larger than that of the cells of the first type (motor cell etc.). 

 The number of their dendrites varies from five to sixteen or even 

 more. These dendrites are much longer than the dendrites of 

 the cells of the first type, undergo less branching and may often 

 be traced as fine varicose branches beyond the bounds of the 

 . ganglion. In preparations of the ganglion cells of Auerbach's 

 plexus, the dendrites of the cells of the second type were now 

 and then traced into the submucosa of the intestine, and in 

 such instances they resemble very closely axis-cylinders. Dogiel 

 thinks that the cells of this structure are sensory sympathetic 

 cells and suggests the possibility of their forming sensory end- 

 ings in the epithelium. The neuraxes of these cells may arise 

 either from the cell body directly or from one of the proto- 

 plasmic branches. They leave the ganglion through one of its 

 nerve roots, in which they may become invested with a thin 

 layer of myelin. They could now and then be traced into an- 

 other ganglion, where one, two or three branches were given off. 

 These branches, which may or may not be myelinated, break 

 up into secondary branches, which take part in the formation 

 of the inter-cellular plexus of the ganglion. The axis-cylinder 

 may pass on and terminate in another ganglion. Dogiel states 

 it quite probable that the sympathetic fibers which end in peri- 

 cellular baskets about the cell bodies of the spinal ganglion cells 



