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Pulmonary valve

Recommended video: Heart valves [16:57]
Overview of the heart valves and related structures.

The pulmonary valve is found at the pulmonary orifice just above the conus arteriosus, guarding the outflow of blood from the right ventricle into the pulmonary trunk. It is one of the two semilunar valves of the heart, along with the aortic valve, and is also referred to as the right semilunar valve. It has three semilunar cusps or leaflets (right, left and anterior), which attach partly to the infundibulum (conus arteriosus) and partly to the pulmonary trunk origin. 

The free edges of the cusps face upwards into the lumen of the pulmonary trunk such that they form little pockets (pulmonary sinuses) with the wall of the pulmonary trunk. The free edge of the cusp has a thickened middle part called the nodule, and a thinner lateral part called the lunula. The valve is open during systole allowing blood to pass into the pulmonary trunk and closes during diastole to prevent backflow of blood into the right ventricle. 

Terminology English: Pulmonary valve
Latin: Valva trunci pulmonalis
Structure/location Three semilunar cusps guarding pulmonary orifice
Function Prevents backflow of blood into right ventricle during diastole

Learn more about the valves of the heart with this study unit: 

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