单选题:关于牙周膜,不恰当的为(  )。

题目内容:
关于牙周膜,不恰当的为(  )。 A.牙周膜内同时含有成骨细胞和破骨细胞
B.牙周膜内无上皮结构
C.牙周膜的纤维主要为胶原纤维
D.牙周膜内成纤维细胞最多
E.牙周膜内的未分化间充质细胞在牙周膜的修复中起重要作用
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