What is the medical term for vessel that brings blood to heart from all parts of body below muscle?

The medical term for the vessel that brings blood to the heart from all parts of the body below the muscular diaphragm is the inferior vena cava. It is the largest vein in the body and plays a vital role in the circulatory system by returning deoxygenated blood from the lower extremities, abdomen, and pelvis back to the heart. The inferior vena cava receives blood from various veins, including the common iliac veins, renal veins, hepatic veins, and lumbar veins, before emptying into the right atrium of the heart.