PLATE I 



Eye 



Schematic illustration of the distribution of the vegetative nervous system, showing 

 its division into sympathetic and parasympathetio components and their branches 

 to the various organs. (Modified from Meyer and Gottleib. ) 



The thoracicolumbar portion of the cord, which gives origin to the sympathetic 

 component, is indicated in red. The portions of the midbrain and medulla, and 

 sacral segments of the cord, which give origin to the parasympathetic component, 

 are indicated in blue. The peripheral nerves belonging to the parasympathetics are 

 shown as solid blue lines, while those belonging to the sympathetic system are shown 

 as broken red lines. This chart shows the double innervation of the structures of 

 the head, heart, and the entire enteral system, and likewise indicates the single 

 innervation for the blood vessels, pilomotor 'and sweat glands. 



