HuBER, Sensory' Nerve-fibers in Visceral Nerves. 145 



nection with the fact that all the earlier observers, who described 

 large medullated nerve fibers in the white rami and the sympa- 

 thetic nerves found only a few in each ramus. Gaskell (i) in 

 his figure of a typical white ramus shows a very small number 

 of large medullated fibers. The numbers given by Edgeworth 

 (4), for the large medullated fibers in the white rami of a small 

 dog, vary from 6 to 28 for the different rami examined. I infer 

 that Langley (3) would place the number higher, although the 

 exact numbers are not always given. Yet he states: " In the 

 white rami there are, in most cases, more fibers larger than 4 ^ 

 than are shown in the particular white ramus figured by Gas- 

 kell. " It would, therefore, it seems to me, not be unreasonable 

 to suggest that the relatively small number of medullated affer- 

 ent fibers going to the viscera is in some measure compensated 

 for by the repeated division of these fibers and by the relatively 

 large area covered by their branches. My own observations 

 have led me to conclude that the medullated fibers under dis- 

 cussion terminate, after dividing as above stated, in numerous 

 arborizations. These, as Griinstein (21) has correctly stated, 

 and as has been shown by me in a former paper, may be term- 

 inal arborizations — ' terminales ' Baumchen — the endings of the 

 medullated branches after losing their medullary sheaths, or 

 lateral arborizations — ' lateralen ' Apparaten — the terminations 

 of non-meduUated, collateral branches, given off, at the nodes 

 of Ranvier, from the medullated branches. The nerve fiber 

 reproduced in the accompanying figure ends in some 45 to 50 

 arborizations, of which about one-half are terminal arboriza- 

 tions, the remainder lateral arborizations. The arborizations 

 are formed by a subdivision of the medullated branches after 

 losing their medullary sheaths or by a subdivision of the collat- 

 eral, non-meduUated branches. The ultimate branches show 

 both in Golgi and methylen blue preparations varicosities vary- 

 ing in shape, size and number, and terminate in small terminal 

 nodules or discs, which also vary in shape and size. It may not 

 be necessary to call further attention to the fact that the afferent 

 nerve fibers which terminate in the hollow organs and gland 

 ducts (also in other parts of the body) end not in one arboriza- 



