Septum primum

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Septum primum
Interior of dorsal half of heart from a human embryo of about thirty days. (Septum primum labeled at center top.)
Gray's subject #135 512
Carnegie stage 13
Gives rise to atrial septum

The cavity of the primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum, which grows downward into the cavity.

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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 As such, some of the information contained herein may be outdated.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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Mammalian development of circulatory system

Heart development - Primitive atrium - Primitive ventricle - Bulbus cordis - Truncus arteriosus - Ostium primum - Foramen ovale - Ductus venosus - Ductus arteriosus - Aortic arches - Septum primum - Septum secundum - Cardinal veins


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