Septum secundum

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Septum secundum
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Interior of dorsal half of heart of human embryo of about thirty-five days. (Septum secundum visible at center top.)
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Same heart as above, opened on right side. (Septum secundum visible in dark area at center top.)
Latin Septum secundum
Gray's p.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 ostium secundum.

Shortly after birth it fuses with the septum primum, and consequently 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 incorporates text from a public domain edition of Gray's Anatomy.