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Importance of Papillary Muscle and Chordae Tendineae in Heart



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

↓

Pressure in ventricles increase

↓

Tends to push atrioventricular valves and open them into atria

↓

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

↓

Prevent the inversion of the valve into atria

↓

No backflow of blood.



If papillary muscles get paralyzed or chordae tendineae rupture

↓

High pressure in ventricles push opens the atrioventricular valves into atria

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Backflow of blood from ventricles into the atria

↓

Cardiac pumping is impaired.

 

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