Left atrioventricular opening

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Left atrioventricular opening
Latin ostium atrioventriculare sinistrum
Gray's p.533

The left atrioventricular opening (mitral orifice) is placed below and to the left of the aortic orifice.

It is a little smaller than the corresponding aperture of the opposite side.

It is surrounded by a dense fibrous ring, covered by the lining membrane of the heart, and is guarded by the bicuspid or mitral valve.

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This article incorporates text from a public domain edition of Gray's Anatomy.