NERVOUS SYSTEM. 35 



filaments. It supplies the stomach, intestines, liver, pancreas, 

 spleen and kidneys. An injury to the solar plexus is always 

 serious. 



FIG. 18. RELATION OF THE SYMPATHETIC AND CEREBRO-SPI NAL 



SYSTEMS. PARTLY DIAGRAMMATIC. 



1, Brain; 2, spinal cord; 3, sympathetics. 



Sympathetic nerves. — These control in part involuntary mus- 

 cle fibers and through these the organs of circulation, respiration, 

 and digestion, and in part the work of the various glands includ- 

 ing the liver, spleen, pancreas, and kidneys. Sympathetic nerves 

 are gray ; cerebro-spinal nerves are white. 



