DISSECTING MANUAL. 



the lumbar gangliated cord. It is connected with subordinate 

 plexuses and gives off the hypogastric nerves. The spermatic 

 is derived from the aortic plexus and gets branches from the 

 renal. The ovarian has the same origin as the preceding and 

 is connected with the uterine plexus. The inferior mesenteric 

 is derived from the aortic plexus and forms plexuses on the 

 branches of the inferior mesenteric artery. [713] 



Hypogastric Plexus. This is formed from the hypogastric 

 nerves, which descend from the aortic plexus on the aorta and 

 become plexiform over its bifurcation and the sacral promon- 

 tory. It continues downward on the sacrum on either side of 

 the rectum, bifurcating, and ends in the pelvic plexuses. [71 4] 



Pelvic Plexuses. These are prolongations of the halves of 

 the hypogastric plexus, one on each side of the rectum. Each 

 accompanies the internal iliac artery and its branches and gives 

 off subordinate plexuses. Each gets fibres from the upper 

 sacral part of the gangliated cord, and visceral branches from 

 the sacral nerves. [714] 



Subordinate Plexuses. The hemorrhoidal is connected with 

 the inferior mesenteric. The vesical lies on the vesical ar- 

 teries. The prostatic lies on either side of the gland, and is 

 prolonged forward on each side as the cavernous plexus of the 

 penis. The uterine accompanies the artery between the folds 

 of the broad ligament and communicates with the ovarian 

 plexus. The vaginal is formed mainly by visceral branches of 

 sacral nerves entering the pelvic plexus, and forms a cavernous 

 plexus for the clitoris. [714] 



ARTERIES. 



Abdominal Aorta. Beginning at the aortic opening in the 

 diaphragm, at the middle of the lower border of the last dorsal 

 vertebra, this descends on the left side of the spine to the left 

 side of the body of the fourth lumbar vertebra, and there 

 divides into the common iliac arteries. [798] 



[206] 



