444 



THE ORGANS 



Smooth muscle Type II ? 



Somatic efferent 



Somatic afferent 



Splanchnic cerebrospinal afferent 



Splanchnic cerebrospinal efferent 

 Sj'mpathetic 



Dorsal root 



Spinal ganglion 

 Dorsal ramus 



Ventral ramus 

 Blood vessel 



Smooth muscle 

 Prevertebral ganglion 



White r. com. — — 



Gray r. com. -- — 



Vertebral or 



chain gang. 



Afferent sym path, neurone 



— Gland 



"^^ Periph. gang. 

 Blood vessel 



Sens, ending 



Pacinian 

 corpuscle 



Fig. 310. — Diagram of the Sympathetic System and the Arrangement of its Neu- 

 rones in a Mammal. On the left are shown the typical elements of a trunk segment- 

 including the sympathetic system. On the right are shown only the somatic afferent 

 and efferent neurones of the spinal nerve. Of the sympathetic system are shown the 

 white and gray rami, threj ganglia of the chain, one prevertebral ganghon and one 

 peripheral ganglion. The symbols used are explained in the figure. In most respects 

 the diagram follows one of Ruber's figures. (Johnston.) 



It will be noted that the sympathetic outflow from any particular cord segment may 

 ultimately reach other segments of the body. 



