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Mitral aus Wikipedia. Zum Beitrag

Mitral valve - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:5:f2a9127573a22335c2a9102b208c73e7 */ Mitral valve From Wikipedia, the free encyclopedia   (Redirected from Mitral) Jump to: , Mitral valve Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Mitral valve labeled at center right.) Base of ventricles exposed by removal of the atria. (Bicuspid (mitral) valve visible at bottom left.) Latin valva atrioventricularis sinistra, valva mitralis Gray's subject #138 534 MeSH Mitral+Valve 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 miter) valve in the heart that lies between the left atrium (LA) and the left ventricle (LV). The mitral 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.

Contents

Overview

A normally-functioning mitral valve opens secondary to increased pressure from the left atrium as it fills with blood. As the pressure increases above that of the left ventricle, the valve opens allowing blood to flow into the left ventricle during diastole (early rapid filling and atrial contraction), and closes at the end of atrial contraction to prevent blood flowing back

Anatomy

The mitral valve is typically 4-6 cm² in area. It has two cusps, or leaflets, (the anteromedial leaflet and the posterolateral leaflet) that guard the opening. The opening is surrounded by a fibrous ring known as the mitral valve annulus. (The orientation of the two leaflets resemble a ) The anterior cusp protects approximately two-thirds of the valve (imagine a crescent moon within the circle, where the crescent represents the posterior cusp). Note that although the anterior leaflet takes up a larger part of the ring and rises higher, the posterior leaflet has a larger surface area. These valve leaflets are prevented from prolapsing into the left atrium by the action of tendons attached to the posterior surface of the valve, chordae tendineae. The inelastic chordae tendineae are attached at one end to the mehr

Mitral aus Wikipedia. Zum Beitrag