HuBER, Sympathetic Nervous System. 131 



root ganglia ; and sometimes a few efferent medullated fibers, 

 passing to the sympathetic gangHa by the white rami, leave 

 the sympathetic ganglia by the grey rami. They are destined 

 to terminate on the aberrant sympathetic cells, lying in the 

 grey rami before they reach the spinal nerves. 



Sensory nerve fibers in the syvipatJietic. There seems to be 

 no doubt that sensory nerve fibers — cerebro-spinal fibers — exist 

 in the sympathetic system. Lenhossek (28) has shown that 

 fibers from the sensory roots enter the sympathetic ganglia, 

 also that the spheno-palatine ganglion (sympathetic, Lenhossek) 

 receives a bundle of nerves from the Gasserian ganglion, and 

 further that some of the peripheral fibers of the geniculate 

 ganglion (this ganglion contains " T "-shaped cells like the 

 spinal ganglia, Lenhossek (92) ) enter the chorda tympani. 

 Lenhossek inclines to the view that these sensory fibers end in 

 the sympathetic ganglia, presumably in peri-cellular baskets, 

 possibly in free endings. From what has been said concerning 

 the white rami and their endings in the ganglia, it may be seen 

 that the central fibers leave the cord through the anterior root. 

 It would seem therefore that these sensory fibers do not end in 

 the ganglia, which they reach probably through the white rami, 

 but pass through the ganglia of the chain and become associ- 

 ated with the efferent sympathetic nerves. They may in this 

 way pass through a number of sympathetic ganglia before 

 reaching their destination. Such medullated fibers, which are 

 larger than the central or pre-ganglionic fibers, have been 

 traced by me through two and through three of the small gan- 

 glia found in the frog's bladder ; and in no instance were they 

 seen to give off any branches before terminating. Kolliker 

 and Langley state that these medullated fibers are of variable 

 size. No doubt many of the medium sized and larger medul- 

 lated fibers found in sympathetic nerves are sensory. As to 

 their mode of ending we have as yet very little positive evi- 

 dence. Some no doubt end in the Pacinian bodies found in 

 the mesentery and occasionally in the pancreas. The medul- 

 lated fibers ending in the Pacinian bodies are, judging from 

 the size of their axis-cylinders as seen in methylen-blue 



