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The sinoatrial nodal artery is a branch of the main coronary arteries, or its derivatives, which supplies blood to the heart's pacemaker, the sinoatrial node. This artery can also supply blood to the crista terminalis and the free walls of both the left and right atrium. The sinoatrial nodal artery most commonly originates from the right coronary artery (68% of patients) and less commonly from the left coronary artery and left circumflex artery (24.7% of patients).[1] The sinoatrial node is a vital component of normal heart function as it provides the initial electrical signal for atrial contraction and sends conductivity signals to the atrioventricular node. The sinoatrial nodal artery is a crucial component in supplying this specialized myocardial tissue with adequate oxygen and nutrients necessary for healthy activity.