Noun
vena cava (plural venae cavae or vena cavas)
(anatomy) Either of the two large veins that take oxygen depleted blood, from the upper body and from the lower body, and return it to the right atrium of the heart.
Several outgrowths of the lateral vena cava project into the renal sac, continuously inflating and deflating as the branchial hearts beat. Source: Internet
The inferior vena cava drains the blood from below the diaphragm and empties into the back part of the atrium below the opening for the superior vena cava. Source: Internet
The superior vena cava drains blood from above the diaphragm and empties into the upper back part of the right atrium. Source: Internet
The venous system finally coalesces into two major veins: the superior vena cava (roughly speaking draining the areas above the heart) and the inferior vena cava (roughly speaking from areas below the heart). Source: Internet