constitutional_part_of regional_part_of Conducting system of left ventricle Subdivision of conducting system of heart Myocardium of basal zone of left ventricle Myocardium of mid zone of left ventricle Myocardium of apical zone of left ventricle Myocardial zone 17 Myocardial zone 4 Myocardial zone 5 Myocardial zone 10 Myocardial zone 11 Myocardial zone 15 Myocardial zone 16 Myocardial zone 17a Myocardial zone 20 Myocardial zone 16a Conducting system of heart Left branch of atrioventricular bundle Posterior division of left branch of atrioventricular bundle FMA:9489 Left posterior division of left branch of atrioventricular bundle Posterior sheet of left branch of atrioventricular bundle Subdivision of conducting system of heart which enters the posterior papillary muscle of the left ventricle and is continuous with the subendocardial branch of the posterior division of the left branch of the atrioventricular bundle. fma