Now, within the right atrium of the heart, we have another type of Shunk that exists. This is known as the foray Mino valley. Now, if we zoom in on the wall separating the right atrium and the left atrium, this is what we get. So the pink section is the wall of the right atrium. The purple section is the wall of that left atrium. And notice on the wall of the right atrium, we have a hole as well as a hole on the wall of the left atrium.