Anatomy Patent formen ovale is due to failure of fusion of- A Ostium primum with Endocardial cushion B Ostium primum with Ostium Secundum C Ostium primum with Septum pnmum D Septum primum with septum secundum 💡 Explanation Patent formen ovale is due to failure of fusion of- ✓ Correct Answer: D. Septum primum with septum secundum