这个词是什么意思？
The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012849 · MeSH 2026。
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