CHAP. II.] 



A NERVOUS SYSTEM. 



though on a much smaller scale, in the course of ultimate 

 peripheral nerve fibres (Beale). 



2. The ingoing nerve fibre, on subsequently reaching its 

 centre, divides into its elementary fibrils, and these become 

 structurally continuous with a fine network of fibrils (Ger- 

 lach) forming the rootlets 

 of ramifying nerve pro- 

 cesses belonging to one 

 or more contiguous nerve 

 cells (fig. 12). 



This kind of connec- 

 tion is thought to exist 

 not only in the spinal 

 cord, but also in the 

 superficial grey matter 

 of the brain (both cere- 

 brum and cerebellum), 

 though it is by no 

 means certain whether 

 the fibres which unite 

 with the cells in this 

 fashion in the latter or- 

 gans constitute ingoing 

 or outgoing channels. 



It is into such a union 

 as this that the fibrils 

 and corpuscles of the 

 ' neuroglia ' (fig. 9) 

 seem to enter. Cer- 

 tainly its network can- 

 not be distinguished or 

 clearly separated, in many nerve centres, from that formed 

 by the ultimate nerve fibrils and the branchlets of ramify- 

 ing cell processes. 



FIG. 13. Multipolar Ganglion Cell from an- 

 terior grey matter of Spinal Cord of Ox. a, 

 Axis cylinder process ; b, branched processes. 

 Magnified 150 diameters. (Deiters.) 



