592 



THE NERVOUS SYSTEM 



solar, and hypogastric; 'but in intimate connection with these are many 

 secondary plexuses, as the aortic, spermatic, and renal. Fibers pass from 

 the prevertebral chain of ganglia and from the cerebro-spinal nerves to these 

 plexuses. 3, Various ganglia and plexuses in the substance of many of the 

 viscera, as in the stomach, intestines, and urinary bladder. These, which 



Gray Ram us 

 White Ramus 



Sy m |\ ath eti c Ga rig I i ort 



Recurrent Branc 



of Meninges 



White 



Ramus 

 GrayRamus 



Sympathetic Ganglion. 



FIG. 418. Schematic Representation of the Relation of the Constituents of the Sympathetic 

 , Chain and the Spinal Nerve. (Modified from Hardesty, in Morris' Anatomy.) 



are for the most part microscopic, also freely communicate with other parts 

 of the system, as well as with the cerebro-spinal axis. 



The connections between these parts are as follows: i, The visceral 

 branch or white ramus, of certain spinal nerves, which passes into the lateral 

 chain. 2, The gray rami consist of bundles of fibers, usually non-medullated, 

 which pass from the chain ganglia back into the spinal or cranial nerves, the 



