Limbus of fossa ovalis

Limbus of fossa ovalis

Infobox Anatomy
Latin = limbus fossae ovalis
GraySubject = 138
GrayPage = 531

Caption = Interior of right side of heart. (Limbus fossae ovalis labeled at left, fourth from top.)

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DorlandsPre = l_10
DorlandsSuf = 12494149
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.

External links

* - "Right atrium, internal structure, anterior view"

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