THE AllTEllIES 465 



The internal iliac autery has a very short trunk, which passes back- 

 wards and outwards in close connection with the sacrum. Its first branch 

 is (a) the umbiHcal artery. It then gives off (b) the artery of bull), after 

 which and just opposite the sacroiliac articulation it divides into a leash of 



Pia. 72.— Br \>fCHEs of the Rioijt Arteria Innominata. 



1. Posterior aorta. 6. 6. 6. A. dorsalis. 



2. 2. 2. 2. Intercostal branches of posterior 7. 7. A. cervicalis superior. 



aorta. 8. 8. 8. Vertebral artery. 



3. Anterior aorta. i». 10. Inosculations of these three arteries. 



4. Right arteria innominata, ending in common 11. Origins of the internal and external thoracic 



carotid and arteries. 



5. Axillary artery. 



branches, which are (c) the obturator, (d) the lateral sacral, and (e) the 

 gluteal artery. The umbilical artery is almost entirely obliterated in the 

 adult, but a small branch still remains passing along the cord which exists 

 as the only remnant of the lai'ge artery which in the foetus carries on the 

 circulation peculiar to that condition. The artery of the bulb supplies the 

 bladder and the internal organs of generation. The obturator artery gives 

 off branches to the muscles of the haunch, and finally ends in the internal 

 pubic artery, which gives blood to the penis and adjacent organs. The 

 lateral sacral artery proceeds backwards along the side of the sacrum 



