ANATOMY AND PHYSIOLOGY OF NERVOUS SYSTEM. 715 



Fig. 290. Diagram of the Great Sympathetic, Representing its 

 Visceral Distribution. (MoEAT.) 



On the right, medulla oblongata, spinal cord, and roots. In the middle, ver- 

 tebral chain and ganglia; on the left, second chain (prevertebral) formed by 

 the pneumogastric nerve and the mesenteric nerves, solar plexus and hypogastric 

 plexus. On the extreme left, terminal ganglia and plexuses of the viscera. 

 The break between the peripheral and ' deep neurons is effected either in the 

 catenary, terminal or intermediate ganglia. Symmetrical with regard to a plane, 

 xy, which intersects the thorax. Principal condensed origins in the thoracic 

 region. Supplementary origins arising from the medulla oblongata (nerve of 

 Wrisberg and pneumogastric) and from the sacral spinal cord (erector nerves). 



