S44' 



THE AUTEBIES. 



2. Internal Viae Arteries of the Pig. 

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

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

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

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



middle line, proceeds backwards on the 

 Fig. 276. inferior face of the os sacrum, and con- 



stitutes the coccygeal arteries, after giving 

 off, at about I5 inches frum its origin, two' 

 lateral branches, traces of the lateral 

 sacral arteries, which furnish the spinal 

 ramusoules of the sacral region. 



The iliac trunk near itb 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 ischiatio ligament in 

 forming the internal pudic artery. 



The latter emits, before leaving the 

 pelvic cavity, a long hemorrhoidal 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 

 two brandies at thi' entrance to the pelvis. 



One of these branches goes towards 

 the viscera contained in the pelvid 

 cavity ; this is the internal pudic artery. 

 It passes backwards, turns the ischial 

 arch, and terminates in the cavernous 

 and dorsal arteries of the penis, after 

 furnishing vesical, hEemorrhoidal, and 

 urethral brandies, as well as the uterine 



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, Su- 

 perior mesenteric artery; 10, The two sper- 

 matic arteries; 11, Inferior mesenteric artery ; 

 12, Sacra media ; I'd, Common iliacs ; 14, Right 

 internal iliac ; 15, External iliac ; IQ, Epigas- 

 tric artery ; 17, Circumflexa ilii ; 18, Common 

 femoral artery, dividing into superficial and 

 deep femoral. 



artery of the female. The latter is very 

 volnminous, and is placed in the sub- 

 stance of the broad ligament, above th6 

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

 jvhere it meets the utero-ovarian artery, after emitting numerous collateral branched, 

 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 



