What is the function of the chordae tendineae?

The chordae tendineae are fibrous cords that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart. Their primary function is to:

1. Prevent Valve Inversion: During ventricular contraction, the chordae tendineae hold the valve leaflets in place, preventing them from inverting into the atria. This ensures that blood flows in the correct direction—from the atria to the ventricles and then out to the body or lungs—without backflow.

2. Maintain Valve Closure: By anchoring the valve leaflets, the chordae tendineae help maintain the closure of the valves during the high-pressure phase of ventricular contraction, contributing to efficient cardiac function.

In summary, the chordae tendineae play a crucial role in maintaining proper heart valve function and ensuring unidirectional blood flow through the heart.