344 SPECIAL ANATOMY. 



597. I. Vena iliacce communes. 



Origin : before the superior part of symphys. sacro-iliaca by the 

 junction of vv. iliacce interna and externa, behind the division 

 of art. iliaca communis. Termination : to the right of the supe- 

 rior border of the fifth lumbar vertebra. Course : obliquely up- 

 wards and inwards. Valves are wanting. 



Iliaca communis dextra \ Iliaca communis sinistra 

 is situated : behind and to the is situated : internal to and be- 

 outside of art. iliaca comm., hind its artery ; at the mouth 

 is shorter, and receives no the art. iliaca commun. dextra 

 branches. It is not compressed descends before it from left to 

 by an artery, like the left com- right ; receives : V. sacra me- 

 rnon iliac vein. dia. 



1. Iliaca interna s. hypogastrica corresponds to the art . hypogastrica, and its 

 branches (the v. umbilicalis, only, opens into v. portoe). Origin : generally 

 from plexus, on the walls and in the organs of the pelvis, and in the external 

 organs of generation. Course : ascends out of the pelvis before m. pyriformis 

 and symphys. sacro-iliaca, is short. Position : behind and internal to the 

 arteries of the same name. They and their branches are supplied with 

 veins. 



a. Plexus hcemorrhoidalis surrounds the inferior extremity of the rectum, 

 and the mucous membrane of the orifice of the anus, is formed by Vv. 

 hcemorrh. superr., branches of v. mesenterica infer., and the vv. hce- 

 morrh. mediae and infer.; branches of v. hypogastrica. 



b. Plexus vesicalis, in the male surrounds Prostata and neck of the blad- 

 der, is connected with a; receives ihe vv. superficiales penis, and gives 

 offvv. vesicales. In the female it is smaller, and unites with plexus va- 

 ginalis. 



c. V. doTsalis penis arises from the foreskin, passes (between its two ar- 

 teries) upon the back of the penis, connected with the deep veins, and 

 enters under the pubic angle through ligam. pubo-prostaticum toplex. 

 prostaticus. In the spongy tissue ofcorpp. cavernosa arise the branches 

 of pudenda interna. 



d. Plexus vaginalis arises in the erectile tissue of the introitus vagina, 

 connected with plex. vesicalis and hcemorrhoid. 



e. Plexus uterinus. The veins of the uterus form large trunks not tortu- 

 ous, at the lateral margins (si'iusuterini), united together transversely, 

 and possessing erectile fibres, like the tissue of the Uterus; they unite 

 with the vv. ovaricce. 



f. Vv. iliolumbalis, sacra lateralis, obturatoria, ischiadica, pudenda, glu- 

 tcea. 



2. Iliaca externa s. cruralis, takes a course like the art. cruralis. In the 



