Septum secundum

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Septum secundum
Interior of dorsal half of heart of human embryo of about thirty-five days. (Septum secundum visible at center top.)
Same heart as above, opened on right side. (Septum secundum visible in dark area at center top.)
Gray's subject #135 512
Carnegie stage 14
Days 33
Gives rise to atrial septum

The septum secundum, semilunar in shape, grows downward from the upper wall of the atrium immediately to the right of the primary septum and foramen ovale.

Shortly after birth it fuses with the primary septum, and by this means the foramen ovale is closed, but sometimes the fusion is incomplete and the upper part of the foramen remains patent.

The limbus fossae ovalis denotes the free margin of the septum secundum.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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