constitutional_part_of regional_part_of Conducting system of left ventricle Subdivision of conducting system of heart Septal division of left branch of atrioventricular bundle FMA:83331 Subdivision of conducting system of heart which remains in the left stratum of the interventricular septum and is continuous with the subendocardial branch of the septal division of left branch of the atrioventricular bundle. fma 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 2 Myocardial zone 3 Myocardial zone 8 Myocardial zone 9 Myocardial zone 14 Myocardial zone 14a Myocardial zone 15a Conducting system of heart Left branch of atrioventricular bundle