NERVE FIBRES AND NERVE CELLS. 



103 



direction away from the muscles to which they are dis- 

 tributed, the}^ will be found, sooner or later, to terminate 

 in ganglia (fig. 24 A. gl.c ; fig. 25, gn. 1 — 13.) A gan- 

 glion is a bod}^ which is in great measure composed of 



71— 



Fig. 2 Jr. — Asfacus fluviatUis. — A., one of the (double) abdominal gan- 

 glia, with the nerves connected with it ( x 25) ; B, a nerve cell or 

 ganglionic corpuscle ( x 250). a. sheath of the nerves ; c, sheath 

 of the ganglion ; co, co', commissural cords connecting the ganglia 

 with those in front, and those behind them. gl.c. points to the 

 ganglionic corpuscles of the ganglia ; n, nerve fibres. 



nerve fibres ; but, interspersed among these, or disposed 

 around them, there are peculiar structures, which are 

 termed ganglionic corpuscles, or nerve cells (fig. 24, B.) 

 These are nucleated cells, not unlike the epithelial cells 

 which have been already mentioned, but which are larger 



