544 



THE AETERIES. 



Fig. 276. 



2. Internal Iliac Arteries of the Pig. 



Two singie branches, originating one above the other, arise from the extremity of 

 the aorta, between the two internal iliac arteries; one divides almost at once into two 

 lateral branches, which go to right and left bene ath the iliacus, and are the representa- 

 tives of the iliaco-muscular arteries of the Horse; the other, or sacra media, placed in the 



middle line, proceeds backwards on the 

 inferior face of the os sacrum, and con- 

 stitutes the coccygeal arteries, after giving 

 off, at about 1^ inches frum its origin, two 

 lateral branches, traces of the" lateral 

 sacral aH^ries, which furnish the spinal 

 ramuscules of the sacral region. 



The iliac trunk near its origin sends 

 off the umbilical artery, is directed back 

 towards the great sciatic notch, there 

 detaches gluteal branches, and is pro- 

 longed beyond the notch to the external 

 surface of the great ischiatic ligament in 

 forming the internal pudic artery. 



The latter emits, before leaving the 

 pelvic cavity, a long hxmorrhoidal artery, 

 that creeps back by the side of the rectum, 

 to be distributed to the posterior extre- 

 mity of that intestine and the adjoining 

 genito-urinary organs. Without the pel- 

 vis, it abandons some gluteal branches, 

 the most considerable and posterior of 

 which represent the ischiatic artery of 

 Solipeds. It then re-enters the cavity 

 of the pelvis, and terminates at the base 

 of the penis by forming the cavernous 

 and dorsal arteries of that organ. 



3. Internal Iliac A rteries of Carnivora. 



The internal iliac arteries in the Car- 

 nivora result from the bifurcation of an 

 arterial trunk, that prolongs the aorta 

 beyond the origin of the external iliacs, 

 as far as the first intersacral articula- 

 tion. 



The pelvic trunk of the Dog at first 

 transmits the umbilical artery, which is 

 remarkable for its small calibre, and the 

 flexuosities it describes before reaching 

 the bladder. 



Then the internal iliac courses for 1 or 

 1 J inches behind, and to the inside of, the 

 pelvi-crural venous trunk, dividing into 



viscera contained in the pelvic 

 cavity ; this is the internal pudic artery. 

 It passes backwards, turns the ischial 



ABDOMINAL AORTA, WITH ITS BRANCHES, IN 



MAN. 



1, Phrenic arteries; 2, Cceliac axis; 3, Gastric 

 artery ; 4, Hepatic artery, dividing into right 

 and left hepatic branches ; 5, Splenic artery, 



passing outwards to the spleen ; 6, Supra- two branches at the entrance to the pelvis, 

 renal artery of right side ; 7, Right renal One of these branches gee's towards 

 artery longer than the left, passing outward the 

 to right kidney ; 8, Lumbar arteries ; 9, Su 

 perior mesenteric artery; 10, The two sper- 



matic arteries; 11, Inferior mesenteric artery ; arch, and terminates in the cavernous 

 12, Sacra media; 13, Common iliacs; 14, Right and dorsal arteries of the penis, after 

 internal iliac; 15, External iliac; 16, Epigas- furnishing vesical, hsemorrhoidal, and 

 trie artery ; 17, Circumflexa ilii ; 18, Common urethral branches, as well as the uterine 

 femoral artery, dividing into superficial and artery of the female. The latter is very 

 deep femoral. voluminous, and is placed in the sub- 



stance of the broad ligament, above the 



email curvature of the uterine cornu, whence it is directed forward to the ovary, 



where it meets the utero-ovarian artery, after emitting numerous collateral branches, 



remarkable for the richness of the vascular network they form in the walls of the uterus. 



The second branch of the internal iliac artery resembles the subsacral artery and its 



