2. © Dr. Anand Srinivasan  The location of the cardiogenic tissues  Processes that occur in the partitioning of the atria and ventricles.  Enumeration of the arterial systems with their various components

3. © Dr. Anand Srinivasan  Splanchnopleuric mesoderm  Cranial to prochordal plate  “Cardiogenic area”  Pericardial cavity = Intra – embryonic coelom

4. © Dr. Anand Srinivasan

7.  Heart tube  Series of dilatations  Bulbous cordis ▪ Conus ▪ Truncus arteriosus  Primitive ventricle  Primitive atrium  Sinus venosus ▪ Right horn ▪ Left horn Atrio-ventricular canal

8. © Dr. Anand Srinivasan Sinus venosusRight VitellineUmbilical Common cardinal Left VitellineUmbilical Common cardinal

9. © Dr. Anand Srinivasan

13.  Sinus venosus shift to right  Left horn regresses  Sino atrial orifice  Septum spurium

14. © Dr. Anand Srinivasan  Atrio-ventricular canal  Atrio-ventricular cushions  Dorsal bud  Ventral bud  Septum intermedium

15. © Dr. Anand Srinivasan

24.  Septum primum  Foramen primum  Foramen secundum  Septum secundum  Foramen ovale  Fossa ovalis

25. © Dr. Anand Srinivasan

33.  Main part  Primitive atrium  Sinus venosus  Atrio-ventricular canal  Right half

34. © Dr. Anand Srinivasan

36.  Left horn  Coronary sinus  Right common cardinal vein  Superior vena cava  Right vitelline vein  Terminal part of Inferior vena cava  Right margin of sino – atrial orifice  Crista terminalis

37. © Dr. Anand Srinivasan

41.  Primitive atrium  Left  Atrio-ventricular canal  Left  Pulmonary veins  Absorbed parts

42. © Dr. Anand Srinivasan

50.  Bulbous cordis  Conus  Truncus arteriosus

52. © Dr. Anand Srinivasan  Spiral septum  Truncus arteriosus  Inter ventricular septum  Bulbar septum  Atrio-ventricular cushion

53. © Dr. Anand Srinivasan

68.  Pulmonary & aortic  Endocardial cushions at the junction of ▪ Truncus arteriosus ▪ Conus  Mitral & Tricuspid  Connective tissue under endocardium

69. © Dr. Anand Srinivasan

77. PERSISTANT PERFORATIONS IN SEPTUM PRIMUM

78. © Dr. Anand Srinivasan SHORT SEPTUM PRIMUM

79. © Dr. Anand Srinivasan LARGE FORAMEN OVALE

80. © Dr. Anand Srinivasan PATENT FORAMEN PRIMUM

81. © Dr. Anand Srinivasan

86. ECTOPIA CORDIS

87. © Dr. Anand Srinivasan