Q. Name the adult derivatives from following regions of Primitive Heart?

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Ans : The primitive heart dilates into five areas, The five embryologic regions and their adult derivatives are as follows:

1.  Truncus arteriosus → proximal aorta and proximal pulmonary artery
2.  Bulbus cordis → smooth parts of the right ventricle (conus arteriosus) and left
ventricles
3.  Primitive ventricle → right and left ventricles (trabeculated parts)
4.  Primitive atrium → right and left atria
5.  Sinus venosus → smooth part of right atrium, the coronary sinus, and oblique vein

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