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 | |
|---|---|
 | |
 Same heart as above, opened on right side. (Septum secundum visible in dark area at center top.) | |
| Details | |
| Carnegie stage | 14 |
| Days | 33 |
| Gives rise to | atrial septum |
| Identifiers | |
| Latin | Septum 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.
References
This article incorporates text in the public domain from page 512 of the 20th edition of Gray's Anatomy (1918)
External links
- Embryology at Temple Heart98/heart97a/sld037
- cardev-039—Embryo Images at University of North Carolina
- Overview at edu.mt
- MedEd at Loyola GrossAnatomy/thorax0/Heart_Development/Atria.html
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