<P> The anterolateral papillary muscle more frequently receives two blood supplies : left anterior descending ( LAD ) artery and the left circumflex artery ( LCX ) . It is therefore more frequently resistant to coronary ischemia ( insufficiency of oxygen - rich blood ) . On the other hand , the posteromedial papillary muscle is usually supplied only by the PDA . This makes the posteromedial papillary muscle significantly more susceptible to ischemia . The clinical significance of this is that a myocardial infarction involving the PDA is more likely to cause mitral regurgitation . </P>
which area of the heart receives its blood supply from the left circumflex artery
anterolateral papillary muscle