<P> The interventricular septum (IVS, or ventricular septum, or during development septum inferius), is the stout wall separating the ventricles, the lower chambers of the heart, from one another . </P> <P> The ventricular septum is directed obliquely backward to the right, and curved with the convexity toward the right ventricle; its margins correspond with the anterior and posterior interventricular sulci . The lower part of the septum which is the major part, is thick and muscular and its much smaller upper part is thin and membraneous . </P> <P> The interventricular septum, is the stout wall separating the ventricles, the lower chambers of the heart from one another . </P> <P> The ventricular septum is directed obliquely backward to the right, and curved with the convexity toward the right ventricle; its margins correspond with the anterior and posterior longitudinal sulci . The greater portion of it is thick and muscular and constitutes the muscular interventricular septum . Its upper and posterior part, which separates the aortic vestibule from the lower part of the right atrium and upper part of the right ventricle, is thin and fibrous, and is termed the membranous ventricular septum . </P>

What is the function of the interventricular septum in the heart