| Limbus of fossa ovalis | |
|---|---|
| Interior of right side of heart. (Limbus fossae ovalis labeled at left, fourth from top.) | |
| Latin | limbus fossae ovalis |
| Gray's | subject #138 531 |
The limbus of fossa ovalis (annulus ovalis) is the prominent oval margin of the fossa ovalis. It is in the right atrium.
It is most distinct above and at the sides of the fossa; below, it is deficient.
A small slit-like valvular opening is occasionally found, at the upper margin of the fossa, leading upward beneath the limbus, into the left atrium; it is the remains of the fetal aperture between the two atria.
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 As such, some of the information contained within it may be outdated.
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