Septum 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.)
Details
Carnegie stage	14
Days	33
Gives rise to	atrial septum
Latin	Septum secundum
*Anatomical terminology* [edit on Wikidata]

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.

References

This article incorporates text in the public domain from 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

Development of the circulatory system

Heart

Tubular heart	Truncus arteriosus Bulbus cordis Primitive ventricle Primitive atrium Sinus venosus

Septa	Atrioventricular cushions/Septum intermedium Primary interatrial foramen Septum primum Foramen secundum Septum secundum Foramen ovale Aorticopulmonary septum

Other	Atrioventricular canal Primary interventricular foramen Protein signalling in heart development

Vessels

Arteries	Dorsal aorta Aortic arches Aortic sac

Veins	Anterior cardinal vein Posterior cardinal vein Common cardinal veins

Lymph vessels	Lymph sacs

Extraembryonic
hemangiogenesis

Fetal circulation

umbilical cord: Umbilical vein → Ductus venosus → Inferior vena cava → Heart → Pulmonary artery → Ductus arteriosus → Aorta → Umbilical artery

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