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a heart valve composed of a set of three semilunar cusps (valvules); hence both the aortic and pulmonary valves are semilunar valves.
Synonym(s): valvula semilunaris [TA]
Either of two valves, one located at the opening of the aorta and the other at the opening of the pulmonary artery, each consisting of three crescent-shaped cusps and serving to prevent blood from flowing back into the ventricles.
Etymology: L, semi + luna, moon, valva, folding door
sem·i·lu·nar valve(sem'ē-lū'năr valv) [TA]
A heart valve composed of a set of three semilunar cusps (valvules); hence, both the aortic and pulmonary valves are semilunar valves.
semilunar valveeither of the heart valves
- (a) at the orifice of the pulmonary artery, or
- (b) at the orifice of the aorta. Each consists of three flaps which ensure that blood flows in only one direction.
shaped like a half-moon or crescent.
valve guarding the entrances into the aorta and pulmonary trunk from the cardiac ventricles.
semilunar valve anomaly
abnormal development causes an irregular central perforation of the valve and the signs of valvular stenosis.