... 界沟 sulcus terminalis 固有心房 atrium proper 右心耳 right auricle ...
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left atrium proper 固有左心房
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The sino-atrial node is situated at the junction between the atrium proper and the sinus venarum of the fight atrium, inclined to the wall of the sinus venarum and covered only with the epicardium.
结果表明：窦房结位于腔静脉窦与固有心房交界处的心外膜下，偏向腔静脉窦壁。
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