part of part of organ part cardiac valve cusp of cardiac valve cardiac valvule SCTID:30822008 FMA:7232 semilunar valvule cardiac valve cusp Wikipedia:Cusps_of_heart_valves UBERON:0006009 NCIT:C33849 The part of the heart valves that serves to seal the heart valves when closed. There are three cusps for each valve except for the mitral valve, which has only two (hence its alternate name, 'bicuspid valve'). 'Nodules' are located at the tip of the valve, to form a tighter seal[WP]. cardial valve cusp cardiac valvular cusp