THE NERVOUS SYSTEM 



435 



other parts of the body (corpuscles of Pacini, end bulbs, etc.) and, together with 

 their envelopes, may represent the receptors of the ganglion itself and of the 

 connected nerves. 



Sympathetic fibres enter the ganglion and form a plexus within it from which 

 fibres pass and terminate within the capsules of the various ganglion cells. 



.1 



B 



C 



a.f. 



s.p. '^c^ 



p p p c 



D E F 



Fig. 301. — Cerebro-spinal Ganglion Cells and their Capsules. (Cajal.) A (adult 

 man), Unipolar cell with single process forming a glomerulus; B (man), cell with short 

 process ending in intracapsular bulb and main process giving off intracapsular collateral; 

 C (dog), "fenestrated" cell with several processes uniting to form main process; D (ass), 

 more complicated form of the same; E (man), cell with short bulbous dendrites; F (man), 

 cell with bulbous dendrites and enveloped with pericellular arborizations (p.a.) of fibres 

 (a.f.) terminating around cell; c, collateral; d, dendrite; p, principal process; s.p., short 

 process. (Cajal's silver stain.) 



The peripheral processes of the cerebro-spinal ganglion 

 CELLS are the afferent fibres of the cerebro-spinal nerves (p. 430). 

 The modes of termination of these peripheral processes in receptors 



