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atrioventricular valve
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atrioventricular valve

anatomy
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Quick Summary

The atrioventricular valves are crucial components of the heart's structure, preventing the backflow of blood. These valves, the tricuspid and mitral valves, are thin, leaflike structures situated between the atria and ventricles.1

The tricuspid valve, located on the right side, has three cusps and is made of endocardium reinforced with connective tissue. The mitral valve, on the left, has two flaps and is stronger due to the left ventricle's higher pressure.1

These valves open to allow blood flow as the atria contract and close when the ventricles contract, preventing blood from returning to the atria. Tendinous cords and papillary muscles help limit the backward movement of the valve flaps.1

Abnormalities in these valves, such as stenosis (narrowing) or regurgitation (incomplete closure), can lead to serious heart conditions like heart failure.23

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
3 Britannica Sources
  1. human cardiovascular system - Valves of the heart
  2. semilunar valve
  3. cardiovascular disease - Abnormalities of the atrial septum

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