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Left Semilunar Leaflet of Pulmonary Valve
Cardiovascular System

Left Semilunar Leaflet of Pulmonary Valve

Valvula semilunaris sinistra valvae trunci pulmonalis

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The pulmonary valve has three semilunar leaflets (or cusps). These are the right, left, and anterior (nonadjacent) leaflets located between the outflow tract of the right ventricle and the pulmonary trunk.

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Key Features/Anatomical Relations

The leaflets are covered with endocardium and are attached to the wall of the infundibulum and supporting structures of the right ventricle. The semilunar valves do not require chordae tendineae or papillary muscles to function as their semilunar attachment to the aortic wall gives them their inherent stability.


The left semilunar leaflet is one of three leaflets forming the pulmonary valve, which permits unidirectional flow of oxygenated blood from the right ventricle to the pulmonary trunk, preventing any retrograde flow.

List of Clinical Correlates

- Congenital pulmonary valve stenosis

- Congenital pulmonary valve atresia

- Pulmonic regurgitation

Learn more about this topic from other Elsevier products

Pulmonary Valve

ScienceDirect image

For pulmonary valves dysfunction, indications are 35mmHg gradient and/or moderate valve regurgitation in a patient big enough to tolerate a 22Fr delivery system.

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