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The sinuatrial nodal artery (or more commonly sinoatrial nodal artery) is an artery of the heart which supplies the sinoatrial node, and arises from the right coronary artery in around 60% of people. In about 40% of cases, the sinoatrial artery is a branch of the left coronary artery or one of its branches. The origin of the sinoatrial node artery is not related to coronary artery dominance, which is which side provides the circulation to the back of the heart. In contrast, the atrioventricular nodal branch is dependent on coronary artery dominance. The sinoatrial node surrounds the sinoatrial artery, which can run centrally ( in 70% of individuals ) or off center within the node.〔Sanchez-Quintana D, Anderson RH, Cabrera JA, et al. The terminal crest: morphological features relevant to electrophysiology. Heart 2002;88: 406–411.〕 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 aspect of the interatrial septum.〔Click RL, Holmes DR Jr, Vliestra RE et al. Anomalous coronary arteries: Location, degree of atherosclerosis and effect on survival-A report from the coronary artery surgery study. J Am Coll Cardiol 1989; 13:531-537.〕 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. .〔Saremi F, Channual S, Abolhoda A et al. MDCT of the S-shaped sinoatrial node artery. Am J Roentgenol 2008; 190:1569-1575.〕 This artery is larger than normal and supplies a good part of the left atrium, including 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. ==Additional images== File:Gray492.png | Sternocostal surface of heart (right coronary artery visible at left) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sinoatrial nodal artery」の詳細全文を読む スポンサード リンク
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