The interventricular septum is the stout wall separating the
ventricles, the lower chambers of the
heart, from one another. 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 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.
Blood supply The
posterior interventricular artery, a branch of
right coronary artery, supplies the posterior 1/3 of the interventricular septum. The remaining anterior 2/3 is supplied by the anterior interventricular artery, which is a septal branch of the
left anterior descending artery, which is a branch of
left coronary artery. ==Development==