The membranous pa of the atrioventricular pa of interventricular septum is between
High-Yield Explanation
Inderbir Singh&;s Human embryology; Tenth edition; Pg 244The membranous pa of the interventricular septum is divisible into an anterior pa which separates the right and left ventricle and a posterior pa which separates the left ventricle from the right atrium ( also called interventricular septum).