The chordae tendinae are strong, fibrous strings which attach on one end to the edges of the tricuspid and mitral valves of the heart and on the other end to the papillary muscles (which is a small muscle within the heart that serve to anchor the valves). When the cusps close, the chordae tendineae prevent them from fluctuating back into the atrium cavity (on the upper chamber). If chordae tendineae of tricuspid valve is partially non-functional due to some injury, then the flow of blood into the pulmonary artery will be reduced.

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