All of the Following Veins Drain into the Inferior Vena

Question

All of the following veins drain into the inferior vena cava EXCEPT ________.
A) lumbar veins
B) gonadal veins
C) adrenal veins
D) external iliac vein

Accepted Answer

The external iliac vein does not drain into the inferior vena cava, as it becomes the common iliac vein just before joining the inferior vena cava. The other options (lumbar veins, gonadal veins, and adrenal veins) all directly drain into the inferior vena cava.