430 SPECIAL ANATOMY. 



artery for the spleen, and giving branches to the pancreas 



andfundus ventriculi. 



2. Plexus mesentericus superior, a dense plexus of whitish-gray 

 nerves at the origin of art. mesent. super. , contains on the left side 

 a large ganglion, which is connected with gangl. cceliacum. Be- 

 fore it lies the pancreas, and it receives the pkx. pancreaticus, as 

 well as the intestines to which the branches of art. mesent. sup. 

 go, supporting the plexus. 



II. Plexus inter mesentericus aortce (s. aorticus abdominalis), 

 lies between art. mesenterica superior and inferior, forms ganglia, 

 and unites with the mesenteric, renal, inferior caval and spermatic 

 plexus, and sends branches to the sciatic and vesical plexus. 



III. Plexus mesentericus inferior, accompanies the arteries of the 

 same name and its branches ; unites in the meso-rectum with the 

 sciatic plexus. 



IV. Plexus renaks, are situated before and behind the renal ves- 

 sels ; are superior, middle, and inferior, forming small ganglia, and 

 are connected with the principal ganglia (see above). In the kid- 

 neys the nerves pass with the arteries, give filaments to the renal 

 calyces, and twine around the straight urinary canaliculi. 



V. Plexus vencz cavce inferiores, are but slightly developed, arise 

 especially from pi. inter mesentericus, connected with renal, sper- 

 matic, and hepatic plexus. 



681. C. The Pelvic Plexus. 



I. Plexus divisionis aortcz abdominalis, a superior and inferior. 

 The superior lies under the origin of art. mesenterica inferior, pass- 

 ing a little to the left ; its right portion passes upon art. hypogas- 

 trie, dexter, the left on the art. h&morrh. intern, to the pi. ha- 

 morrh. intern. The inferior is more delicate, lies between the two 

 art. iliaccB, and goes into the pkx. hypogastrici. 



II. Plexus hcemorrhoidalis superior s. 5. romani, lies between 

 the two layers of the superior (sigmoid flexure) meso-rectum, is in 

 connexion with the nerves of the vas deferens, and especially of 

 the left ureter. 



III. Pkxus hypogastrici, a superior azygos and two inferior 

 lateral. 



1. Plexus h. impar, goes on the right side of the art. iliaca, 

 passing off from the plexus at the place of division of the 

 aorta, and enters right and left the 



2. Pkxus h. lateraks. These descend on the artt. hypogastr.; 

 form long plexuses, and are surrounded by a ligamentous 

 mass, They are in connexion, below, with 



