NERVE FIBRES AND NERVE CELLS. 103 
direction away from the muscles to which they are dis- 
tributed, they will be found, sooner or later, to terminate 
in ganglia (fig. 24 A. gl.c; fig. 25, gn. I—13.) A gan- 
glion is a body which is in great measure composed of 
Fig. 24.— Astacus fluviatilis.—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 ; , 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 
