ANATOMY

Detailed explanation-1: -The interatrial septum is a thin wall of tissue that separates the right and left atria of the heart. In adult life, its main function is to separate the two atrial chambers so that there is no shunting of blood between them.

Detailed explanation-2: -The interatrial septum is a septum that lies between the left atrium and right atrium of the human heart. The interatrial septum lies at angle of 65 degrees from right posterior to left anterior because right atrium is located at the right side of the body while left atrium is located at the left side of the body.

Detailed explanation-3: -The interatrial septum is a thin fibromuscular wall situated between the right and left atria of the heart. In adults, the interatrial septum has a centrally positioned depression known as oval fossa. This depression marks the place where foramen ovale was placed during fetal development.

Detailed explanation-4: -Soon after birth, the elevation in left atrial pressure forces the septum primum and septum secundum together, collapsing the space between the septa and therefore closing the opening between the left and the right atria. At this point, normally the septa will fuse and become the interatrial septum.

Detailed explanation-5: -A wall of muscle called the septum separates the left and right atria and the left and right ventricles. These are referred to as the atrial and ventricular septum.