COMMON ILIAC. 



143 



Lumbar.^ (t^'ig. 122.) Arise on each side of the aorta, are four 

 or five in number ; they correspond with the intercostals of the chest, 

 and supply the loins, &c. 



Middle sacral.^ — Is the termination of the aorta arising at its 

 bifurcation into the iliacs. It descends along the median line of the 

 sacrum. 



Fig. 124. 



COMMON ILIAC. 



The aorta^ divides into the iliacs aboufthe fourth lumbar vertebra. 

 The iliac^ descends obliquely outwards to the sacro-iliac articulation, 

 being crossed by the ureter, and divides into the external and internal 

 iliac. 



