Vena Femoralis is a term used in anatomy to describe the major vein in the thigh. It carries deoxygenated blood from the lower extremities back to the heart. Though commonly referred to as the femoral vein, there are several synonyms for this important part of the circulatory system. Some of these synonyms include the deep femoral vein, crural vein, and the great saphenous vein. Understanding these synonyms is essential for medical professionals as they work to diagnose and treat conditions that affect the venous system. Whether referred to by its common name or one of its synonyms, the Vena Femoralis is a critical component of human anatomy.