THE AUTONOMIC SYSTEM 331 



the sympathetic chain by the splanchnic nerves to termi- 



A CERVICAL 5E6KIENT 



T-POSTERIOR. ROOT 



AN UPPER DORSAL SEGMENT \ 



SYMPATHETIC, 

 GANGLION 



Fig. 61. — Diagram to show how a dor.sal segment of the cord has both 

 a white and a grey ramus, while a cervical segment has a grey 

 ramus only. 



nate in the collateral gangha — the semilunar ganghon, the 

 superior and inferior mesenteric gangha. 



