The mitral valve (also known as the bicuspid valve or left atrioventricular valve) is a dual-flap (bi- from the Latin, meaning double, and mitral- from the Latin, meaning shaped like a mitre) valve in the heart that lies between the left atrium (LA) and the left ventricle (LV). The mitral valve (not to be confused with the congenital bicuspid aortic valve) and the tricuspid valve are known collectively as the atrioventricular valves because they lie between the atria and the ventricles of the heart and control the flow of blood.
During diastole, a normally-functioning mitral valve opens as a result of increased pressure from the left atrium as it fills with blood (preloading). As atrial pressure increases above that of the left ventricle, the mitral valve opens. Opening facilitates the passive flow of blood into the left ventricle. Diastole ends with atrial contraction, which ejects the final 20% of blood that is transferred from the left atrium to the left ventricle. This amount of blood is known as end diastolic volume (EDV), and the mitral valve closes at the end of atrial contraction to prevent a reversal of blood flow.
Read more about Mitral Valve: Anatomy, Normal Physiology, On Auscultation, Additional Images
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... (Bicuspid valve visible at center.) Front of thorax, showing surface relations of bones, lungs (purple), pleura (blue), and heart (red outline) ... Heart valves are labeled with "B", "T", "A", and "P" Apical view of valves Cross-sectional view of mitral valve between left atrium (upper chamber) and left ventricle ...
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... MPV mean platelet volume MR medical representative mental retardation mitral regurgitation modified release (compare time release technology (medicine)) MRA magnetic resonance angiography MRCP magnetic ... MVI Multivitamin MVo2 mixed venous oxygen concentration MVP mitral valve prolapse MVPS mitral valve prolapse syndrome MVR mitral valve replacement Medical abbreviations ← previous page of list (L) next ...