"The valve has anterior and posterior leaflets, the bases of which attach around the AV orifice to a fibrous ring known as the mitral valve annulus (MVA), forming part of the fibrous skeleton of the heart. The chordae tendineae are thin, strong, inelastic, fibrous chords that extend from the free edge of the cusps to the apices of the papillary muscles within the left ventricle. Both cusps receive chordae tendineae from both papillary muscles. The anterior leaflet is thicker and more mobile than the posterior cusp ref, and in general, the cusps of the mitral valve are smaller and thicker than those of the tricuspid valve."