|Interior of dorsal half of heart from a human embryo of about thirty days.|
|Gray's||subject #135 512|
|Gives rise to||septum intermedium|
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The lumen of the atrial canal is reduced to a transverse slit, and two thickenings appear, one on its dorsal and another on its ventral wall. These thickenings, or endocardial cushions as they are termed, project into the canal, and, meeting in the middle line, unite to form the septum intermedium which divides the canal into two channels, the future right and left atrioventricular orifices.
- ↑ Maschhoff KL, Baldwin HS (2000). "<280::AID-AJMG1278>3.0.CO;2-N Molecular determinants of neural crest migration". Am. J. Med. Genet. 97 (4): 280–8. PMID 11376439.
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 As such, some of the information contained herein may be outdated.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.
Prenatal development/Mammalian development of circulatory system
|Vascular||Blood island Cardinal veins - Ducts of Cuvier - Vitelline veins - Ductus venosus - Umbilical vein|
|Heart development||Primitive heart tube: Truncus arteriosus - Bulbus cordis - Primitive ventricle - Primitive atrium - Sinus venosus|
Septum primum (Ostium primum, Ostium secundum) - Septum secundum (Foramen ovale) - other septa (Endocardial cushions/Septum intermedium, Aorticopulmonary septum) - Atrial canal
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