THE EXTERNAL ILIAC ARTERIES. 



cavernous and dorsal arteries of the penis, after furnishing vesical, hsemorrhoidal, and urethral 



branches, as well as the uterine artery (iu the female). The latter is very voluminous, and is 



placed in the substance of the broad ligament, above the small curvature of the uterine cornu, 



■whence it is directed forward to the ovary, where 



it meets the utero-ovarian artery, after emitting Fig. 369. 



numerous collateral branches, remarkable for 



the ricliness of the vascular network they form 



in the walls of the uterus. 



The second branch of the internal iliac 

 artery resembles the lateral sacral artery and 

 its ischiatic branch in Solipeds ; it escapes from 

 the pelvic cavity with the great sciatic nerve, 

 which it accompanies to behind the thigh, where 

 it is expended, after giving off on its course 

 spinal and gluteal twigs. It is not this branch 

 which supplies the coccygeal arteries; these 

 come, as in the Pig and Ruminants, from the 

 middle sacral artery. 



Comparison op the Internal Iliac Arteries 

 IN Man with those op Animals. 



The aorta in Man bifurcates at the fourth 

 lumbar vertebra to form the common iliac arteries, 

 which descend to each side of the margin of the 

 pelvis, where they divide into two branches — 

 the internal and external iliacs. 



The internal iliac, or hypogastric artery, 

 passes beneath the sacro-iliac articulation, and 

 breaks up into nine or eleven branches that go 

 to the walls of the pelvic cavity, or to the organs 

 contained in it. Their disposition somewhat 

 resembles that of Carnivora ; in their distribution 

 they represent the various branches of the in- 

 ternal iliac of Solipeds. Thus we find: 1. An 

 umbilical artery. 2. The vesico-prostafic artery, 

 resembling the branch of the same name given 

 off in tiie Horse by the internal pudic. 3. The 

 middle hcemorrhoidal artery, that passes to the 

 rectum like the branch of the internal pudic. 

 4. The ileo-lumhar artery, the iliaco-rnuscular 

 of Solipf'ds. 5. The lateral sacral artery, which, 

 behind, joins the middle sacral instead of divid- 

 ing, as in the Horse, into ischiatic and lateral 

 coccygeal. 6. The obturator artery. 7. Gluteal 

 artery. 8. Ischiatic. 9. Internal pudic, that 

 terminates, as in animals, by the cavernous, 

 dorsalis penis, and the transversa perinei arte- 

 ries. The arterial branches of the rectum, or 

 inferior hamorrhoidal, are furnished by the in- 

 ternal pudic artery. 



Article IV. — External Iliac Arteries, or Crural Trunks (Fig. 370, 11). 

 These external branches of the terminal quadrifurcations of the posterior 

 aorta descend on the sides of the entrance to the pelvic cavity, in describing a 

 curve downwards and forwards, and an oblique direction downwards, backwards, 

 and outwards. Maintained within the psoas parvus and iliacus muscles by the 

 peritoneum covering them, they are bordered posteriorly and inwardly by the 

 iliac vein, which isolates them from the pelvic trunk. When they arrive at 

 the anterior border of the pubis, in the interstice separating the pectineus from 



ABDOMINAL AORTA, WITH ITS BRANCHES, IN 

 MAN. 



1, Phrenic arteries ; 2, coeliac axis ; 3, gastric 

 artery; 4, hepatic artery, dividing into right 

 and left hepatic branches; 5, splenic artery, 

 passing outwards to the spleen ; 6, supra- 

 renal artery of right side ; 7, right renal 

 artery longer than the left, passing outward 

 to right kidney ; 8, lumbar arteries ; 9, 

 superior mesenteric artery ; 10, the two 

 spermatic arteries; 11, inferior mesenteric 

 artery; 12, sacra media ; 13, common iliacs ; 

 14, right internal iliac; 15, e.xternal iliac; 

 16, epigastric artery ; 17, circumflexa ilii ; 

 18, common femoral artery, dividing into 

 superficial and deep femoral. 



