Primitive heart tube

Primitive heart tube

Infobox Embryology
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Caption = Diagram to illustrate the simple tubular condition of the heart.


Caption2 = Heart of human embryo of about fourteen days.
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Days = 21
Precursor = splanchnic mesoderm
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The primitive heart tube is the earliest stage of heart development.

From the inflow to the outflow, it consists of sinus venosus, primitive atrium, the primitive ventricle, the bulbus cordis, and truncus arteriosus. [cite web |url=http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1767109 |title=Development of the human heart: days 15–21 |accessdate=2007-09-18 |format= |work=]

It forms primarily from splanchnic mesoderm. [cite web |url=http://isc.temple.edu/marino/embryology/Heart98/heart_text.htm |title=Text for Cardiovascular Development |accessdate=2007-09-18 |format= |work=] More specifically, they form from endocardial tubes, starting at day 21. [cite web |url=http://www.meddean.luc.edu/Lumen/meded/grossanatomy/thorax0/heartdev/tube.html |title=Heart Tube Formation |accessdate=2007-09-18 |format= |work=]

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