The only difference between the ascending and descending aorta is the direction of the artery. The ascending aorta is only the area from the aortic semilunar valve to the aortic trunk. The descending is the part of the artery that takes it down the abdomen.The difference in the superior and inferior vena cava is the same, where the superior runs cranially and the inferior runs down the abdomen.They both, vena cavae, dump into the right atrium. :) I hope that answers your question.You have the flow listed correctly already.he only difference between the ascending and descending aorta is the direction of the artery. The ascending aorta is only the area from the aortic semilunar valve to the aortic trunk. The descending is the part of the artery that takes it down the abdomen.