THE SYMPATHETIC SYSTEM 



295 



EYE:IRIDO-DILIT. 



MUSCLE OP NULLER 



OT. CAROT 

 PERIVA5C PLEXUS 



PERIVASC 

 VERTEBR 

 PLEXUS 



PE.RIVASCULAR 

 PLEXUS, SUBCLAtA 

 AND ITS BRANCHES 



SPNINCT 



OF 

 D/GEST/VE 



WO .GEM 



APP 

 SMOOTH 

 CENJT 

 Ml/SC 

 1USC OF 





FIG. 27. Thoracieo-lumbar portion. 



This diagram shows the general disposition of the thoracic lumbar (or true sympathetic) portion 

 of the vegetative nervous system. The intra medullary column, formed by the superposition of 

 the vegetative axis central nuclei, is drawn in black between D 1 and L 3 on the left half of the 

 spinal axis. On the same side (in this diagram) arise the connecting central ganglionic fibers going 

 to the lateral chain. Some of the fibers go through the lateral chain to reach the solar plexus or 

 inferior mesenteric plexus (and its dependency the hypogastric plexus). The majority of the fibers 

 connect with the ganglionic cells of the lateral chain from which arise the ganglionic organic fibers. 

 As regards to these fibers the somatic distribution is shown on the right, the splanchnic distribution 

 on the left. 



