Limbus of fossa ovalis

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Limbus of fossa ovalis
Gray493.png
Interior of right side of heart. (Limbus fossae ovalis labeled at left, fourth from top.)
Latin limbus fossae ovalis
Gray's p.531

The limbus of fossa ovalis (anulus 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 (foramen ovale) between the two atria.

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