Anatomy Which of the following is true about formation of Fossa ovalis ? A Floor is formed by septum secundum B Limbus fossa ovalis by septum primum C Limbus fossa ovalis by septum secondum D None of above 💡 Explanation Which of the following is true about formation of Fossa ovalis ? ✓ Correct Answer: C. Limbus fossa ovalis by septum secondum