664 



THE NERVOUS SYSTEM 



In the discussion the intimate anatomical relationships must be constantly 

 kept in view. 



Organization and Distribution. Strictly speaking, the name auto- 

 nomic nervous system emphasizes physiological groupings of nerve cells 

 and pathways rather than anatomical structures. However, the fact is 

 that outside the brain and spinal cord and exclusive of the somatic nerves 

 there are numerous nerve ganglia. These ganglia are connected by 

 tracts with each other and with the cerebro-spinal axis. 



GrayRamus 

 White Ramus 



Sympathetic Ganglion. 



ogiel 



mnathctic 



SOciatioa 



fiber 



Recurrent Branc 



ofMeninges 



Sympalhetic Ganglion. 



FIG. 417. Schematic Representation of the Relation of the Constituents of the Sympathetic 

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



The chief gross constituent unit to be mentioned is a bilaterally 

 symmetrical double chain of ganglia and connecting nerves extending 

 from the cranium to the pelvis and along each side of and in front of the 

 vertebral column. A ganglion is connected with each of the spinal nerves 



