38 



VETERINARY STUDIES 



portion of the body and limbs with both sensation and motion 

 and furnish other branches which in part make up the two 

 great sympathetic nerve trunks. 



The Sympathetic System 



This consists of tw^o cords, one on each side of the spinal 

 column, and extending from the head to root of tail, together 

 with all the nerves which branch from these two trunks. These 

 cords are not smooth, but have enlargements called ganglia at 



Fig. 22. — Relation op the Sympathetic and Cerebrospinal Systems. 

 Partly Diagrammatic. (Chauveau.) 



1, Brain; 2, spinal cord; 3, sympathetics. 



intervals along their course. Each cord resembles somewhat a 

 small, rather flat, and knotted rope. 



Composition. — These two trunks are composed of nerves 

 from the medulla and from the inferior branches of all the 

 spinal nerves except the coccygeal. By this arrangement and 

 composition, and the frequent connections of sympathetic with 

 cerebrospinal nerves, there is constituted a very perfect union of 

 these two into one gi'eat nervous system. 



Ganglia. — The knots along the two main trunks are ganglia 

 of nerve cells and fibers. One of these, the solar plexus, is 

 really composed of two large ganglia, united by a large cord 

 and many filaments. It supplies the stomach, intestines, liver, 

 pancreas, spleen, and kidneys. An injury to the solar (coeliac) 

 plexus is always serious. 



