sentences:  In less than 1% of humans, the artery has an anomalous origin directly from the coronary sinus, descending aorta, or distal right coronary artery.In more than 50% of human hearts, the artery actually courses close to the superior posterior aspect of the interatrial septum.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.