Pulmonary valve

• The pulmonary valve lies anterior and to the left of the aortic valve. The three pulmonary leafl ets assume the shape of half moons (semi-lunar) and are similar but usually not equal in size. The right and left coronary sinuses of the aorta always face the pulmonary valve. The leafl ets are thinner and more delicate than the aortic leafl ets. Unlike the aortic valve, the pulmonary valve sits on a complete muscular ring of the infundibulum and is not in direct continuity with the tricuspid valve. It is thickest along the closing edge. The delicate pocket-like leaflets are formed primarily of collagen, and they, therefore, open and close passively, with little elastic recoil. In the middle of the free edge of each leafl et is a fi brous mound, the nodule of Arrantius. Coaption of the three nodules ensures complete central closure of the valve orifi ce during ventricular diastole.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Kardiologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Cardiac and Cardiovascular Systems (hsv//eng)

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