constitutional_part_of Mid zone of left ventricle Myocardium of region of ventricle Myocardium of mid zone of left ventricle FMA:86046 Mid zone of myocardium of left ventricle Region of myocardium which is superiorly bounded by the plane of the tip of papillary muscle of left ventricle and inferiorly by the plane of the insertion of the papillary muscle of left ventricle. fma