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This is aortic itself. It is called semilunar because leaflets have semilunar space. Aortic also has 3 cusps, so does pulmonary. But only aortic has coronary arteries starting from its base. You can see two arrows being shown, when the valve closes. When the valve closes it is diastole, and that is when heart supplies blood for itself. There are two coronary arteries, which later branches further - left and right.