tricuspid valve tricuspid valve the tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, at the superior portion of the right ventricle. the function of the valve is to allow blood to flow from the right atrium to the right ventricle during diastole, and to close to prevent backflow (regurgitation) from the right ventricle into the right atrium during right ventricular contraction (systole). "tricuspid" redirects here. for the type of tooth, see dental anatomy. for the semilunar valves, the other two of the three heart valves that are usually tricuspid, see pulmonary valve and aortic valve. tricuspid valveanterior (frontal) view of the opened heart. white arrows indicate normal blood flow. (tricuspid valve labeled at bottom left.)heart in motion: the anterior walls of the ventricles are removed. the action of the tricuspid valve, located in the right ventricle, is seen on the left portion of this illustration. the three leaflets with their attached chordae tendineae and papillary muscles can be seen.detailsidentifierslatinvalvula tricuspidalis, valva atrioventricularis dextrameshd014261ta98a12.1.02.003ta23982fma7234anatomical terminology structure the tricuspid valve usually has three cusps or leaflets, named the anterior, posterior, and septal cusps. each leaflet is connected via chordae tendineae to the anterior, posterior, and septal papillary muscles of the right ventricle, respectively. tricuspid valves may also occur with two or four leaflets; the number may change over a lifetime. function