这个词是什么意思？
A fetal heart structure that is the bulging areas in the cardiac septum between the HEART ATRIA and the HEART VENTRICLES. During development, growth and fusion of endocardial cushions at midline forms the two atrioventricular canals, the sites for future TRICUSPID VALVE and BICUSPID VALVE.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D054089 · MeSH 2026。
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