Intraventricular Septum

Interventricular septum, also called ventricular septum, is the thick muscular wall which divides the right ventricle from the left ventricle of the heart. The ventricular septum is runs obliquely backward and to the right, and is 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 ventricular septum. Its upper and posterior part is thin and fibrous and separates the aortic vestibule from the lower part of the right atrium and upper part of the right ventricle; it is called the membranous ventricular septum.