1 Answer. Michael Walden, Radiologist (2007-present). Answered May 25, 2017. The superior vena cava and inferior vena cava. 1k Views · View Upvoters · promoted by 23andMe · Explore your DNA with 23andMe. Learn more about your health, traits and ancestry through 75+ genetic reports. Learn More at 23andme.com. read more
The largest vein in the body is Vena Cava. The aorta is the largest blood vessel in the body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches. read more
The superior and inferior vena cava are the largest veins in the body. read more