A valve in the cardiovascular system is a device that directs the flow of a fluid by opening, closing, thus enabling forward flow and preventing backflow.
Within the cardiovascular system the opening and closing of the valves of the heart are controlled by the action of the heart. The tricuspid valve and mitral valve are geometrically designed to enable closure within the complex geometry of the ventricles. The valves of the pulmonary artery and aorta are less complex consisting of three almost leaflets. The valves of the veins are more delicate and are composed of two equal leaflets.
There are other valves and remnants of valves that include the valve of the coronary sinus called the Eustachian valve, and the foramen ovale which is part of the fetal valve within the larger structure of the fossa ovalis.
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Short axis of an anatomic specimen showing the tricuspid valve within the right ventricle and the mitral valve within the left ventricle. the anterior leaflet of the mitral valve is in fibrous continuity with the aortic valveAshley Davidoff MD01592
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