72 HUBER. [Vol. XVI. 



3) In other instances the medullary sheath is sooner or later 

 lost, the neuraxes continuing as Remak's fibers — fibers going 

 to the intestine, liver, and spleen. 



4) In many cases the neuraxes of sympathetic neurons are 

 non-medullated throughout. This, it would seem to me, is the 

 structure of the neuraxes of sympathetic cells in the peripheral 

 ganglia — those of the heart, salivary glands, intestine, blad- 

 der, etc. 



Lenhossek (29) and Dogiel (40) have described the giving off 

 of collateral branches from the axis-cylinders of the sympathetic 

 cells of mammalia ; such branches have been traced into the 

 intercellular plexus ; their mode of ending has not, however, 

 been determined. 



Before closing the discussion of the sympathetic neurons in 

 Mammalia, it is necessary to mention some cells found in the 

 sympathetic ganglia, which Dogiel (41) has recently described 

 as sensory sympathetic cells. These cells are said to have the fol- 

 lowing structural peculiarities : The cells are multipolar, with one 

 to sixteen dendrites and one neuraxis ; they are characterized 

 by the structure of the dendrites, which are longer and more slen- 

 der than the dendrites of the other sympathetic cells. These 

 dendrites ramify in the ganglion and may often be traced into 

 one of the nerve trunks connected with the ganglion, in which 

 they may often be followed for long distances. In the ganglia 

 of Auerbach's plexus such dendritic processes could be followed 

 from a ganglion into one of its nerve roots, and then some into 

 the mucosa, others into the submucosa, and so on. The neu- 

 raxes of such cells are described as coming from the cell body 

 or from some dendrite ; in the smaller ganglia such cells have 

 non-medullated axis-cylinders ; in the larger ganglia of the 

 chain this process becomes surrounded with a medullary sheath 

 some distance from the cell body of the sympathetic cell from 

 which it arises. In the plexuses of the intestine Dogiel was 

 able to trace the neuraxes of such sensory sympathetic cells 

 through several ganglia. In the ganglia through which they 

 pass, or in which they end, collateral branches are given off 

 which terminate in the intercellular plexus. Dogiel suggests 

 that such cells may form the anatomical basis for certain phe- 



