题目内容
关于肛管的说法,下列哪项是不正确的 ()
2021-11-29
A.是大肠的末段
B.肛管上段有若干纵行黏膜皱襞
C.在痔环处形成的痨为外痔
D.白线相当于肛门内、外括约肌的分界处
E.肛门内、外括约肌为平滑肌
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