Science, Tech, Math Science Pulmonary Veins Share Flipboard Email Print Heart Image. © MedValet Science Biology Physiology Basics Cells Genetics Organisms Anatomy Botany Ecology Chemistry Physics Geology Astronomy Weather & Climate by Regina Bailey Regina Bailey is a science writer and educator who has covered biology for ThoughtCo since 1997. Her writing is featured in Kaplan AP Biology 2016. Updated March 06, 2017 Definition: Veins are vessels that bring blood to the heart. Pulmonary veins carry oxygenated blood from the lungs to the left atrium. There are four pulmonary veins which extend from the left atrium to the lungs. They are the right superior, right inferior, left superior, and left inferior pulmonary veins. Continue Reading