题目内容

关于盆膈的叙述,正确的是:

A. 由肛提肌、会阴深横肌及盆膈上、下筋膜构成
B. 由肛提肌、尾骨肌及盆膈上、下筋膜构成
C. 封闭整个骨盆下口
D. 其后部有一盆膈裂孔
E. 尿生殖膈位于其上方

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