Fetal Heart Primitive Heart Tube
Smooth part of RA R horn of sinus venosus
Coronary sinus L horn of sinus venosus
R, L auricle Primitive atrium
Smooth part of LA Primitive pulmonary vein
Membranous IV septum Meet at perimembranous area - 1. L conotruncal ridges
  1. Muscular septum
  2. Endocardial cushion | | Smooth part of RV (Conus), LV (Vestibule) | Bulbus Cordis | | Trabeculae carinae of RV, LV | Primitive ventricle | | Aorta, pulmonary vein | Truncus arteriosus |

https://www.youtube.com/watch?v=a0qyagIgBPw

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