GEA T ERAL PRINCIPLES OF ZOOLOGY. 



and the nerve or axis-cylinder processes. The dendritic are 



much branched, forming 

 thereby very fine fibres, i 

 whose nervous nature was 

 earlier generally assumed, 

 but of late has been 

 doubted from many sides. ] 

 The nerve-processes, of 

 which usually only one 

 occurs in a ganglion-cell 

 (Fig. 49), remain for a 

 long time unbranched ; 

 they pass then either un- 

 branched into peripheral 

 nerve-fibres, or finally 

 branch into fine nerve- 



aiis-cvlimlt-r 



process. 



FIG. 49. Human multipolar ganglion-cell. 



(After Gegenbaur.) 



fibrils. 



For a long time apo- 

 lar and unipolar ganglion- 

 cells, with no or only one 

 process, were described 



solely in the i 



' 



FIG. 50. Ganglion-cells of an Actinian. 



animals; both sorts are physiologically unintelligible. For 



