?:definition
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Subdivision of a venous tree (organ) and is a blood vessel of macroscopic dimensions, the lumen of which is continuous with the atria of the heart, directly or indirectly through tributaries of the venae cavae, pulmonary veins and the hepatic and portal veins. Examples: coronary sinus, posterior intercostal vein, hepatic vein, bronchial vein, pulmonary vein, trunk of inferior vena cava.
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