Myocardium of region of ventricle Myocardial zone 20 FMA:86504 Inferoapical zone of myocardium of left ventricle Myocardium of zone 20 of left ventricle Region of myocardium which has as its parts the cardiac muscle tissue, posterior division of left branch of atrioventricular bundle, the cardiac muscle of left ventricle and the fibrocollagenous sheath of cardiac muscle tisuue that is located on the posterior part of the apex zone of myocardium of left ventricle. Zone 20 of myocardium of left ventricle fma