And all these veins basically converge into a single vein known as the vena cava. Now, the superior vena cava is basically the upper vein that carries all that de oxygen blood away from the upper organs. This is a superior vena cava. Superior means above, while the inferior vena cava, where inferior means below, basically is our single blood vessel that carries our deoxy in blood from the organs in the lower portion of our body and to number one. So notice that number one is simply our right atrium. It's where we began.