The tubular heart or 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.
It forms primarily from
splanchnic mesoderm. More specifically, they form from
endocardial tubes, starting at day 21.
References
External links
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Embryology of cardiovascular system
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