Superior Vena Cava refers to a large yet very short vein whose function is to carry the de-oxygenated blood to the heart's right atrium from the upper half of the body. It is basically a combination of the innominate veins that are made up of the left and right brachiocephalic veins. These veins receive blood from the head, neck and the upper limbs, and are further joined by the azygous veing which has the blood from the rib cage. See the link below for more details:
Superior Vena Cava
Superior Vena Cava
