<Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> The interventricular septum (IVS, or ventricular septum, or during development septum inferius), is the stout wall separating the lower chambers (the ventricles) 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 . </P> <Ul> <Li> The greater portion of it is thick and muscular and constitutes the muscular interventricular septum . </Li> <Li> 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 (septum membranaceum). </Li> </Ul>

Where is the septum located in the heart