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Importance of Papillary Muscle and Chordae Tendineae in Heart

https://www.youtube.com/watch?v=6f0n9zJWp_8

Structure

Papillary Muscles

• Muscles inside ventricles.

• Originate from wall of ventricles.

• Attached to cusps of atrioventricular valves via chordae tendineae

Chordae Tendineae

• Fibrous cords

• Connect papillary muscles to cusps of atrioventricular valve.

Function

Prevent the inversion of the atrioventricular valves into atria

During systole

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Pressure in ventricles increase

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Tends to push atrioventricular valves and open them into atria

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However, contraction of papillary muscles pulls the cusps of atrioventricular valves towards ventricles

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Prevent the inversion of the valve into atria

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No backflow of blood.

If papillary muscles get paralyzed or chordae tendineae rupture

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High pressure in ventricles push opens the atrioventricular valves into atria

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Backflow of blood from ventricles into the atria

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Cardiac pumping is impaired.

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