notch of cardiac apex notch of cardiac apex the anterior interventricular sulcus and posterior interventricular sulcus extend from the base of the ventricular portion to a notch, the notch of cardiac apex, (or incisura apicis cordis) on the acute margin of the heart just to the right of the apex. notch of cardiac apexdetailsidentifierslatinincisura apicis cordista98a12.1.00.008ta23942fma75133anatomical terminology