180 HANDBOOK OF ANATOMY 



In the cervical region there are only three ganglia on each 

 side, but below this there is a ganglion on each side opposite 

 each vertebra. 



The ganglia in the cervical and thoracic regions form plexuses 

 on the vessels in their vicinity, and also form plexuses to supply 

 the pharynx, larynx, heart, and lungs. In addition they com- 

 municate with the lumbar ganglia by means of the splanchnic 

 nerves, which pierce the diaphragm to join the solar plexus. 



The Splanchnic Nerves, three in number, are formed by 

 branches from the fifth to the twelfth thoracic ganglia. 



The Solar Plexus consists of three parts the coeliac plexus- 

 and the two semilunar ganglia. They lie behind the stomach,, 

 on the aorta, just above the coeliac axis. They send out 

 branches, which form subsidiary plexuses, accompanying the- 

 branches of the artery to the various organs. 



The Aortic Plexus is the continuation on the front of the aorta 

 of the solar plexus, and, like the latter, forms subsidiary plexuses 

 on the branches of the vessel. 



