Tricuspid valve: Tricuspid valve is the valve between the right atrium (upper chamber) and the right ventricle (lower chamber). It prevents backflow of blood from the right ventricle to the right atrium when the latter contracts. Tricuspid valve, as the name implies, has three leaflets. The leaflets are held taut when the right ventricle contracts, by thread like structures attached to the leaflet tips known as ‘chordae tendinae’. These in turn are connected to the sides of right ventricle by small muscles known as ‘papillary muscles’.