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The oblique vein of the left atrium (oblique vein of Marshall) is a small vessel which descends obliquely on the back of the
left atrium The atrium ( la, ātrium, , entry hall) is one of two upper chambers in the heart that receives blood from the circulatory system. The blood in the atria is pumped into the heart ventricles through the atrioventricular valves. There are two atr ...
and ends in the
coronary sinus In anatomy, the coronary sinus () is a collection of veins joined together to form a large vessel that collects blood from the heart muscle ( myocardium). It delivers deoxygenated blood to the right atrium, as do the superior and inferior ven ...
near its left extremity; it is continuous above with the
ligament of the left vena cava The fold of the left vena cava, ligament of the left vena cava, or vestigial fold of Marshall, is a triangular fold of the serous pericardium that lies between the left pulmonary artery and subjacent pulmonary vein. It is formed by the folding of ...
(lig. venæ cavæ sinistræ vestigial fold of Marshall), and the two structures form the remnant of the left
Cuvierian duct The common cardinal veins, also known as the ducts of Cuvier,Veins of the torso {{circulatory-stub