sinoatrial nodal artery sinoatrial nodal artery the sinoatrial nodal artery (or sinuatrial nodal artery or sinoatrial artery) is an artery of the heart which supplies the sinoatrial node, the natural pacemaker center of the heart. it is usually a branch of the right coronary artery. it passes between the right atrium, and the opening of the superior vena cava. sinoatrial nodal arterylow magnification micrograph of a sinoatrial node (central on image), surrounding the sinuatrial nodal artery (on lumen in the image). h&e stain.arteries:rca = right coronaryab = atrial branchessanb = sinuatrial nodalrma = right marginallca = left coronarycb = circumflex branchlad/aib = anterior interventricularlma = left marginalpia/pda = posterior descendingmarg = left marginalavn = atrioventricular nodalveins:scv = small cardiacacv = anterior cardiacaiv/gcv = great cardiacmcv = middle cardiaccs = coronary sinusdetailsidentifierslatinramus nodi sinuatrialis arteriae coronariae dextraeta98a12.2.03.104 a12.2.03.212ta24133fma3823anatomical terminology anatomy origin it arises from the right coronary artery in around 60% of individuals, from the left circumflex coronary artery in about 40% of individuals, and in less than 1% of humans, the artery has an anomalous origin directly from the coronary sinus, descending aorta, or distal right coronary artery. the origin of the sinoatrial node artery is not related to coronary artery dominance, which means the side (right or left) that provides the circulation to the back of the heart. in contrast, the atrioventricular nodal branch, that is the artery that brings blood to the atrioventricular node, depends on coronary artery dominance. course in more than 50% of human hearts, the artery actually courses close to the superior posterior aspect of the interatrial septum. the sinoatrial node surrounds the sinoatrial artery, which can run centrally (in 70% of individuals) or off-center within the node. variation a left s-shaped sinoatrial artery, originating from the proximal left circumflex or lcx artery, has been described as a common variant in approximately 10% of human hearts. this artery is larger than normal and supplies a good part of the left atrium, but also right-sided structures like part of the sinoatrial node and the atrioventricular nodal areas. in this variant, the artery courses in the sulcus between the left superior pulmonary vein and the left atrial appendage where it could be susceptible to injury during catheter or surgical ablation procedures on the left atrium, especially for atrial fibrillation ablation or open-heart cardiac surgery. additional images sternocostal surface of heart (right coronary artery visible at left)