The big toe has two phalanges.
大趾有两节趾骨.
In 1951, Bell classified this disorder as brachydactyly type A1 ( BDA1), which is characterized by shortening or missing of the middle phalanges.
1951年,Bell将该遗传病归为A1型短指(趾)症,其主要特征是中间指(趾)节缩短或缺失。
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