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The normal adult MV area is 4–6 cm2. Unlike other heart valves, the MV consists of two asymmetric leaflets. The aortic (anterior) leaflet makes up 65% of the valve area but its base forms only 35% of the circumference. The mural (posterior) leaflet usually consists of three main scallops, although there may be up to five. The leaflets are joined at the anterolateral and posteromedial ends of the commissure. The aortic MV leaflet shares the same fibrous attachment as the non-coronary cusp of the AV.