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February 1962

The Mitral ValveAnatomy and Pathology for the Surgeon

Arch Surg. 1962;84(2):174-198. doi:10.1001/archsurg.1962.01300200022003

Anatomy  The mitral valve in the normal adult consists of 2 tough, membranous, elastic, extremely thin and pliable leaflets anchored at their bases to the annulus. Numerous slender tendinous chords are attached at the margins of their ventricular surfaces. The chords arise from 2 muscular masses on the anterior and posterior walls of the ventricular myocardium. Figure 2 illustrates the anatomy of the mitral valve derived from a sphere.In Figure 2A, a shell which is slightly less than a hemisphere has an irregularly shaped portion removed from it, creating 2 flaps which when everted resemble the leaflets of the mitral valve (Fig. 2B). Motion of the flaps away from the center of the original sphere illustrates the valve opening (Fig. 2C); motion of the flaps towards the center demonstrates valve closure (Fig. 2D). The larger, tongue-like, flap is variously known as the anteromedial, septal, major,

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