Question

An oval depression called fossa ovalis is seen on

• A. Inter atrial septum
• B. Inter ventricular septum
• C. Right auriculo-ventricular septum
• D. Left auriculo-ventricular septum

Answer 1

Answer: (A)

Inter atrial septum

Fossa ovalis is the oval depression present in the septum separating the two right and left atria. In congenital heart anomalies, there is a failure in the closing of this septa due to which the oxygenated blood gets mixed with the deoxygenated blood. The fossa ovalis is the remnant of a thin fibrous sheet that covered the foramen ovale (opening in the atrial septum between left and right artery) during fetal development.

So, the correct answer is option A.