AND PHYSIOLOGY. 



339 



Fig. 328. 



c 



Roots of a Dorsal Spinal Nerve, and its union with the Sympathetic. 



c, c, Anterior Fissure of the Spinal Cord, fl, Anterior Root, p, Posterior Root, with 

 its Ganglion, a', Anterior Branch, p', Posterior Branch. «, Sympathetic. e, Its 

 Douhle Junction with the Anterior Branch of the Spinal Nerve by a White and Gray 

 Filament. 



of communication around the vessels. And as all the inter- 

 nal organs, especially those called vital, are supplied with this 

 nerve, and not directly from the cerebro-spinal center, it is 

 hence called a nerve of organic life. 



604. Sympathetic Ganglia —Each of these ganglia may 

 be considered as a nervous center sending forth strands in 

 three directions ; 1st, to join the spinal nerves in their dis- 

 tribution ; 2d, to the spinal cord itself ; 3d, to the next sym- 

 pathetic ganglion above. 



604. What may each of these ganglia be considered as ? 



