338 HUMAN ANATOMY. 



The lumbar ganglia lie along inner margin of the psoas 

 muscle. They communicate above and below with the other 

 ganglia and with the lumbar spinal nerves,, and give off internal 

 branches which form the hypogastric plexus. 



The sacral ganglia are situated internal to the anterior 

 sacral foramina. They unite below in front of the coccyx in the 

 coccygeal ganglion, or ganglion impar. They communicate with 

 the sacral nerves, join the pelvic plexus, and send branches on the 

 middle sacral artery. 



CARDIAC PLEXUS. The cardiac plexus, formed from the 

 superior, middle, and inferior cardiac nerves from the cervical 

 ganglia, and the cardiac branches from the pneumogastric and 

 recurrent laryngeal, consists of two portions the superficial and 

 deep. 



The superficial cardiac plexus, situated beneath the arch of 

 the aorta, is formed by the left superior cardiac nerve and the left 

 inferior cervical cardiac nerve, and contains the cardiac ganglion 

 of Wrisberg. It forms part of the anterior coronary plexus, and 

 sends branches to the left anterior pulmonary plexus. 



The deep cardiac plexus lies between the arch of the aorta 

 and trachea, and receives all the cardiac nerves except the two 

 mentioned above. It forms part of the anterior coronary and 

 posterior coronary plexuses. 



The SOLAR PLEXUS, or "abdominal brain," consists of ganglia 

 and a net-work of nerve branches, formed chiefly from the 

 branches of the two great splanchnic nerves and branches from 

 the right pneumogastric. It is situated between the aorta and 

 the crura of the diaphragm and the stomach, and surrounds the 

 superior mesenteric artery and cceliac axis. 



Its ganglia are two crescentic ganglionic masses the semi- 

 lunar ganglia (the largest in the body) situated in front of the 

 crura of the diaphragm. They are composed of smaller ganglia 

 aggregated together. From the solar plexus and semilunar gan- 

 glion are derived numerous branches which are distributed as 

 plexuses over all the abdominal arteries, as follows: 



Cceliac, Phrenic, Aortic, 



Gastric, Suprarenal, Superior mesenteric, 



Hepatic, Renal, Inferior mesenteric, 



Splenic, Spermatic, Ovarian. 



The HYPOGASTRIC PLEXUS is situated below the bifurcation 

 of the aorta, in front of the sacrum, and is formed by branches 

 from the lumbar ganglia and aortic plexus. It divides into two 

 parts which, with branches from the sacral ganglia and nerves, 

 become the pelvic plexuses. 





