520 A MANUAL OF ANATOMY. 



lower intercostals, lumbar, and lateral branches of the deep 

 epigastric arteries. 



The External Iliac Veins. Figs. 103, 104, 105. 



They begin under Poupart's ligament, as the continuation 

 of the femoral veins, at the inside of the external iliac 

 arteries. 



Each passes upward along the inside of the artery to ter- 

 minate where the artery begins by joining with the internal 

 iliac vein to form a common iliac vein. 



The left vein is at the inner side of the artery for its 

 entire course, and posterior to the artery. The right vein 

 starts at the inner side of the artery and at its termination 

 has begun to pass behind it. 



Tributaries. The deep epigastric, and circumflex iliac 

 veins, which collect the blood from the area supplied by 

 the arteries of the same names, also a pubic vein which 

 joins the obturator and external iliac veins. 



The Internal Iliac Veins will be given later. 



The Common Iliac Vein. Figs. 103 to 106. 



Is formed by the junction of the external and internal 

 iliac veins. It extends from the sacro-iliac articulation to 

 the right of the aortic bifurcation, where they unite to form 

 the vena cava inferior. The left vein is behind and at the 

 inside of the left artery, and ends behind the right artery. 

 The right vein is first behind, then behind and at the out- 

 side of its artery. 



Tributaries. The iliolumbar, and middle sacral veins. 



The Vena Cava Inferior. Fig. 106. 



Is formed at the right of the abdominal aorta, and behind 

 the right iliac artery over the fifth lumbar vertebra, by the 

 union of the two common iliac veins, and passes upward 



