Primitive heart tube
Diagram to illustrate the simple tubular condition of the heart.
Heart of human embryo of about fourteen days.
Days	21
Precursor	splanchnic mesoderm

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.^[1]

It forms primarily from splanchnic mesoderm.^[2] More specifically, they form from endocardial tubes, starting at day 21.^[3]

[edit] References

1. ^ "Development of the human heart: days 15–21". http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1767109. Retrieved 2007-09-18. 
2. ^ "Text for Cardiovascular Development". http://isc.temple.edu/marino/embryology/Heart98/heart_text.htm. Retrieved 2007-09-18. 
3. ^ "Heart Tube Formation". http://www.meddean.luc.edu/Lumen/meded/grossanatomy/thorax0/heartdev/tube.html. Retrieved 2007-09-18. 

[edit] External links

• Embryology at Temple Heart98/heart97a/sld018
• Embryology at Temple Heart98/heart97a/sld019

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v • d • e Prenatal development/Mammalian development of circulatory system (GA 5) Vascular Blood island Development of arteries Dorsal aorta · Aortic arches Development of veins Cardinal veins · Ducts of Cuvier Fetal circulation umbilical cord: Umbilical vein → Ductus venosus → Inferior vena cava → Heart → Pulmonary artery → Ductus arteriosus → Umbilical artery yolk sac: Vitelline veins · Vitelline arteries Heart development Primitive heart tube Truncus arteriosus · Bulbus cordis · Primitive ventricle · Primitive atrium · Sinus venosus Septa/ostia Endocardial cushions/Septum intermedium · Ostium primum · Septum primum (Ostium secundum) · Septum secundum (Foramen ovale) · Aorticopulmonary septum Other Atrial canal heart navs: anat/physio/dev, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc