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The ventricular septum, also known as the interventricular septum, is a muscular structure that divides the left and right ventricles of the heart. It cosists of a thick muscular part, and a thin membranous part.

The cardiac septa refer to the muscular walls located between the two atria and the two ventricles.

The atrioventricular septum results from an offset in the attachment of the two atrioventricular valves. This offset situates a portion of the ventricular septum in an atrioventricular position. This particular section is recognized as the atrioventricular septum and it is positioned posterior to the hinge of the tricuspid valve.

The limbus fossae ovalis is a prominent margin that borders the oval fossa, It is more proeminent above and on the margins.

The fossa ovalis is a depression located in the lower part of the interatrial septum. It is located at the site of the former foramen ovale and is especially noticeable after birth.