In human anatomy, the<unk> s are formed by the external iliac veins and internal iliac veins and together, in the abdomen at about the level of the umbilicus, form the inferior vena cava.  They drain blood from the pelvis and lower limbs.
Both<unk> s are accompanied along their course by common iliac arteries.
Common iliac vein
Common iliac artery
Internal iliac artery
Testicular vein
Suprarenal veins
Femoral vein
Splenic vein
Testicular artery