Right marginal branch Posterior interventricular branchRight coronary artery  Left marginal branch Circumflex branchAnterior interventricular branchRight marginal branchof right coronary artery Right coronary arteryRight atriumRight ventricleSinu-atrial nodal branchof right coronary arteryABCPosterior interventricularbranch of right coronary artery Anterior interventricularbranch of leftcoronary artery Left coronary arteryCircumflex branchof left coronary arteryLeft marginal branchof circumflex branchDiagonal branch ofanterior interventricular branchLeft auricleLeft ventricle