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pulmonary vein : ウィキペディア英語版
pulmonary vein

The pulmonary veins are large blood vessels that receive oxygenated blood from the lungs and drain into the left atrium of the heart. There are four pulmonary veins, two from each lung. The pulmonary veins are among the few veins that carry oxygenated blood.
==Structure==
Two 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 vein drains each lung, so there are four veins in total.
The veins are fixed to the pericardium. The pulmonary veins travel alongside the pulmonary arteries
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 pulmonary veins (contains oxygenated blood) pass behind the right atrium and superior vena cava; the left in front of the descending thoracic aorta.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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