As Boyden initially indicated, the naming of peripheral venous structures in the lungs is much more difficult than the naming of arteries, as the arteries can be named by the bronchi they correspond to, and thus by the segment they supply, while the veins are located remotely from the bronchi. Centrally, the left upper lobe veins drain into the superior pulmonary vein, and right and left lower lobe veins drain into the right and left inferior pulmonary veins. On the right, upper lobe veins usually form a common superior pulmonary vein that joins with middle lobe veins to form a common superior pulmonary venous confluence. The venous return from the right middle lobe occasionally enters the left atrium separately.
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