<P> The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart . The largest pulmonary veins are the four main pulmonary veins, two from each lung that drain into the left atrium of the heart . The pulmonary veins are part of the pulmonary circulation . </P> <P> Two main pulmonary veins emerge from each lung hilum, receiving blood from three or four bronchial veins apiece and draining into the left atrium . An inferior and superior main vein drains each lung, so there are four main veins in total . </P> <P> At the root of the lung, the right superior pulmonary vein lies in front of and a little below the pulmonary artery; the inferior is situated at the lowest part of the lung hilum . Behind the pulmonary artery is the bronchus . The right main pulmonary veins (contains oxygenated blood) pass behind the right atrium and superior vena cava; the left in front of the descending thoracic aorta . </P> <P> Occasionally the three lobar veins on the right side remain separate, and not infrequently the two left lobar veins end by a common opening into the left atrium . Therefore, the number of pulmonary veins opening into the left atrium can vary between three and five in the healthy population . </P>

Does the right side of the heart carry oxygenated blood