Week 7 - (outflow) aortic and pulmonary trunks completely separated
Week 8 - external form similar to that at birth, total embryonic heart growth - 0.5 mm to 5 mm growth
Week 4 - Dorsal view, Sinus venosus migrates towards the right
End of week 4 - fourth arches appear, sinus venosus single opening into atria
Week 5 - branched pulmonary vein arises, hepatic part of inferior vena cava (IVC) developing within liver, right pulmonary arch declining to disappear
Week 6 - pulmonary branches taken up by left atrium
Week 7 and 8 - superior vena cava (SVC) migrates upwards
End of Week 8 - coronary sinus, draining veins of cardiac wall
Week 11 - 4 secondary pulmonary branches have openings into the left atrium
Next: Part 5
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