regional_part_of Anterior interventricular branch of left coronary artery Zone of anterior interventricular branch of left coronary artery Zone 15a of anterior interventricular branch of left coronary artery Apical inferoseptal zone of anterior interventricular branch of left coronary artery FMA:86515 Zone 15a of LAD Zone of anterior interventricular branch of left coronary artery which supplies the apical inferoseptal zone of myocardium of left ventricle and is continuous with zone 13 of anterior interventricular branch of left coronary artery. fma