The common femoral vein and inferior epigastric vein originate from which vein?

The common femoral vein and inferior epigastric vein both originate from the external iliac vein. The external iliac vein is a major vein that drains blood from the lower limbs and forms as a continuation of the femoral vein. It plays a crucial role in venous return from the leg, as well as the pelvis and lower abdomen.

Specifically, the inferior epigastric vein branches off from the external iliac vein and serves to drain blood from the abdominal wall. Meanwhile, the common femoral vein is formed from the merging of the femoral vein and the profunda femoris (deep femoral) vein, and it continues to become the external iliac vein as it ascends toward the pelvis. This anatomical relationship is essential in understanding venous drainage and the vascular anatomy of the lower extremity, making the external iliac vein the correct answer in this context.