略語大辞典 [Med] 21 SAN sinoatrial node 洞房(結節). 心臓のペースメーカー組織. 上大静脈と右心房の接合部の上にある. sinoatrial node; or SA(sinoatrial) node; or nodus sinuatrialis; a tissue in the heart; the primary site of automaticity, from which the initial stimulus for muscle contraction spreads through the atrial muscula 丸善「略語大辞典」JLogosID : 11858572