434 



THE ORGANS 



terminate in other parts of the ganglion and its covering, either in terminal 

 arborizations or in terminal enlargements or bulbs. The collaterals may branch. 

 Some of the terminations may be around the capsules of other cells. There may 

 be one or several collaterals, sometimes a number of very short intracapsular 

 collaterals. This last variety of cell may have more than one main process. 

 (Fig. 300, 2 and 3, Fig. 301, B). (c) Cells with split processes. Here the main 

 process divides into a number of fibres which reunite; this may be repeated. The 

 splitting may be intracapsular or extracapsular. A variation of this is where 

 there are two to six processes from the cell which form a complicated intra- 

 capsular network, finally uniting to form the single main process (Fig. 300, 4 

 and 5 and Fig. 301 , C and D) . (d) Cells with a number of dendrite-like processes 



Fig. 300. — Various Types of Cells and Nerve Terminations found in a Spinal 

 Ganglion. Schematized from Dogiel. g.r., gray ramus communicans; sy.c, sympa- 

 thetic cell; w.r., white ramus communicans. a. Spinal ganglion; b, dorsal or afferent 

 root; c, ventral or efferent root; d, sympathetic ganglion; g, spinal nerve. For further 

 explanation see text (pp. 433-435). 



which divide, forming an intracapsular network which finally fuses into the main 

 process (Fig. 300, 6). (e) Cells whose principal process divides as usual, but 

 the peripheral branch terminates by arborizations or bulbs in the ganglion and 

 in its covering, or in the neighborhood of the dorsal root (Fig. 300, 7). (f) 

 Bipolar cells (Fig. 300, 8). (g) Multipolar cells with a number of intracapsular 

 dendrites and a main process (Fig. 300, 10; Fig. 301, E and F). (h) Cells with 

 a principal process which probably enters the dorsal root and a number of proc- 

 esses which may be dendrite-like in character, but also become meduUated in 

 places, and which branch and terminate in arborizations or bulbs in various 

 parts of the ganglion. These latter apparently collectively represent the per- 

 ipheral process which here ends in the ganglion (Fig. 300, g) 



The various endings in the ganglion of collaterals and other processes of 

 ganglion cells often have capsules and resemble the terminations in receptors in 



