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Sinus venosus - draining fluid and blood cells from 3 pairs of vessels (vitelline veins, umbilical veins, common cardinal veins)
common cardinal veins = ducts of Cuvier (Scale bar 1 mm)
- Heart tube - bends ventrally to the right
- Caudal to cranial sequence: sinus venosus - primitive atria - conus - truncus arteriosus - aortic arches
Middle Week 3 (Gestational Age - week 5)
- Splanchnopleuric mesoderm - differentiated into epimyocardial mantle around the tubes
- Two heart tubes - brought together by the folding of the body
- Foregut - lies dorsal to the heart tubes
End Week 3
- Spontaneous cardiac contractions
- Detachment of the heart tube dorsally
- Primordia of transverse sinus of the pericardium
Next: Part 3
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