Septum secundum

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

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.)
Carnegie stage14
Gives rise toatrial septum
LatinSeptum secundum
Anatomical terminology

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.


This article incorporates text in the public domain from page 512 of the 20th edition of Gray's Anatomy (1918)

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