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16. The sympathetic nervous system. This system consists of two ganglionated 

 cords, which anteriorly fie in contact with the vertebral column, while 

 posteriorly they are in connection with the sides of the aorta. The anterior 

 pair of ganglia communicate with the 1st spinal nerve and send branches 

 forwards which, after communicating with the ganglia of the IX. and X. 

 cranial nerves seem to end in the Gasserian ganglion. Each of the eight 

 following ganglia are connected to their corresponding spinal nerves by a 

 single commissure, while the tenth ganglion has several branches reaching 

 it from the tenth (coccygeal) nerve. 



Numerous small branches pass from the various ganglia to the adjacent 

 viscera and blood vessels, and a special set of branches (cardiac) arise from 

 the first ganglion to reach the auricles and the large vessels which pass to 

 and from the heart, while other filaments, springing chiefly from the third, 

 fourth, and fifth ganglia, unite to form a plexus (solar) on the dorsal aspect 

 of the stomach. 



Make a sketch showing a transverse section of the spinal cord, the roots 

 of a pair of spinal nerves, and a pair of sympathetic ganglia connected to 

 these nerves. Make a second sketch showing the 10 pairs of sympathetic 

 ganglia, their connections with each other, and the cranial and spinal nerves 

 and the cardiac and solar plexuses derived from them. 



