| Left atrioventricular opening | |
|---|---|
| Latin | ostium atrioventriculare sinistrum |
| Gray's | subject #139 533 |
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.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
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