HuBER, Sympathetic Nervous System. 137 



white ramus of a segment may terminate in one of the follow- 

 ing ways. 



In the figure, a shows a pre-ganglionic fiber which passes 

 through the chain ganglion of the segment ( I C. G.), to termi- 

 nate in the next higher chain ganglion (III C. G.); b, a pre- 

 ganglionic fiber passing through the chain ganglion of the seg- 

 ment to terminate in the next lower chain ganglion (II C. G.); 

 c, two pre-ganglionic fibers ending in the chain ganglion of the 

 segment ; d, a pre-ganglionic fiber passing through the chain 

 ganglion and ending in a pre- vertebral ganglion {Pr. V. G.) (this 

 fiber may represent one of the fibers of a splanchnic nerve); 

 e, a preganglionic fiber passing through the ganglion of the 

 chain, through a pre-vertebral ganglion to end in a peripheral 

 ganglion ; f, a pre-ganglionic fiber, which gives a collateral 

 branch in one ganglion (terminating in a pericellular basket), 

 and passes on to terminate in some more peripheral ganglion. 

 The ganglion of each segment, probably receives pre-ganglionic 

 fibers from the adjacent higher and lower ganglion, designated 

 by the letters g and h in the figure. 



The sympathetic neurons are colored red in the figure. 

 The cell bodies of such neurons are enclosed in peri-cellular 

 baskets (see figure). The neuraxes of the sympathetic neur- 

 ons may terminate, either in blood-vessels — vaso-motor — /", of 

 the figure ; in the involuntary muscle of the viscera — motor — 

 J, of the figure ; in heart muscle, not shown in the figure ; in 

 glands — secretory fibers — k, of the figure, or in the sympa- 

 thetic ganglion (?), /, of the figure. 



The diagram shows, further, two sensory neurons (Dogiel) 

 one in a peripheral ganglion, ; the other in the chain ganglion, 

 p, its neuraxis ending in the spinal ganglion in a peri-cellular 

 basket, enclosing the cell body of a ' type two ' spinal ganglion 

 cell (Dogiel), g, in the figure. Fig. 14 shows the nerve supply 

 of the sub-lingual and sub-maxillary glands. In this figure the 

 several colors used in Fig. 13, and there described, are again 

 made use of. Sub. max., a portion of the sub-maxillary gland 

 with its duct. S7ib. lifig., a portion of the sub-lingual gland with 

 its duct. Ch. T., the chorda tympani. Ling,, the lingual 



