RCIS Practice Test 2026 – All-in-One Exam Prep

The fossa ovalis is a significant anatomical structure found in the heart, specifically located in the right atrium. It is a depression in the interatrial septum, which is the wall that separates the right and left atria. This structure is the remnant of the foramen ovale, an opening that exists in the fetal heart allowing blood to bypass the non-functioning lungs.

After birth, the foramen ovale typically closes and is transformed into the fossa ovalis. Its primary purpose is related to fetal circulation, but its presence in adults indicates its importance in the developmental stages of the heart.

Understanding the anatomical positioning of the fossa ovalis helps in recognizing its role in establishing the separation between the two atria, which enhances the efficiency of blood flow within the heart. Therefore, the correct identification of its location serves as a foundation for grasping more complex cardiac physiology and pathology.