 Atrioventricular septum

The atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle (LV).Although the name "atrioventricular septum" implies any septum between an atrium and a ventricle, in practice the divisions from RA to RV and from LA to LV are mediated by valves, not by septa.