SYMrATIIETIC SYSTEM. 



319 



210 



From the sympnthctic fpr;istiic) gaiigliuii of the Ray. 



CCXXII. 



211 



It consists of ' ganglionic corpuscles,' or ganglion-vesicles, fig. 210 

 a, h, c, and nerve-fibres, imbedded in a nucleated fibrous tissue. 



The ganglion vesicle may be 

 circumscribed, or be continued 

 into a nerve-fibre, or into two 

 nerve-fibres from opposite poles 

 of tlie vesicle ; it is termed ac- 

 cordingly 'apolar,' 'unipolar,' and 

 ' bi-polar : ' the last is the most 

 common form, the first probably 

 a c'cnctic stase. When a ffan- 

 glion-ccU is connected by more 

 than two processes with nerves, 

 it is a ' multipolar cell : ' these 

 are most common in the ganglia 

 of the main cord of the symjDa- 

 thetic ; the bipolar cells prevail in the ganglia of the posterior 

 roots of the spinal nerves, fig. 

 201. The nerve-fibres in ganglions 

 consist of the ' white ' or Jjroadcr 

 kind,and of the 'grey'or finer kind; 

 there are also still more minute 

 but solid or homogeneous fibres, 

 surrounding and connecting the 

 true nervous constituents of the 

 ganglion. A nerve on entering 

 a ganglion breaks up into its 

 component fibres, which interlace 

 about the ganglion-cells, some- 

 times winding roimd them, with 

 plexiform interchanges of fibres 

 from other entering nerves and 

 from the cells. 



Bidder and Volkman' give the 

 subjoined magnified view, fig. 

 212, of the 'intercommunicating' 

 nerve-fibresbetween a sympathetic 

 o-ano'lion and a spinal nerve in the 

 Fro"-. H p is the sympathetic, n 

 showing the part next the head ; 

 c p is the spinal nerve, C showing 

 the part next the myelon ; « is a portion of the communicatin 



A. Spinal g.aiiglion of tlie Ray, 40 diameters. 

 B. Portion of the same, dissected, ccxxil. 



