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【单选题】
对骨膜的描述 , 正确的是A.
存在于骨的外表面 , 而不存在于骨的内表面
B.
包括骨外膜和骨内膜
C.
骨内膜可分为两层 : 外层含纤维多、细胞少 , 内层含纤维少、细胞多
D.
穿通纤维可从骨外膜外层经内层插入到骨单位骨板
E.
骨内膜的成骨细胞在骨表面排列成单层
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