TEC Cardiologia Practice Questions - TEC - Título De Especialista Em Cardiologia (Sociedade Brasileira De Cardiologia AMB) Exam

The posteromedial papillary muscle has a solitary vascular supply from the posterior descending artery (arising from the RCA or LCx), whereas the anterolateral papillary muscle receives a dual blood supply from both the LAD and LCx. The posteromedial papillary muscle is subjected to higher mechanical shear stress because it attaches exclusively to the anterior mitral leaflet. The posteromedial papillary muscle receives a dual vascular supply from the marginal branches of the circumflex artery and diagonal branches of the LAD. The anterolateral papillary muscle is predominantly composed of fibrous collagen and lacks vulnerable myocardial vasculature.