GENERAL PRINCIPLES OF ZOOLOGY. 



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



much branched, forming 

 f / thereby very fine fibres, 

 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- 

 fibrils. 



For a long time apo- 

 lar and unipolar ganglion- 

 cells, with no or only one 

 process, were described 



FIG. 49. Human multipolar ganglion-cell. Solely In tllC i 



(After Gegenbaur.) J 



Nervp or 



.xis-cvlinder 



process. 



FIG. 50. Ganglion-cells of an Actinian. 



animals; both sorts are physiologically unintelligible. For 



