次生髓射线 secondary medullary ray

互联网2013-11-14

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　　是指形成层射线原始细胞形成的射线。是初生木质部和初生韧皮部之间作辐射状水平伸展的组织，其达到初生木质部和初生韧皮部者称为次生髓射线，可与两者无关的短射线即三生髓射线相区别。与初生髓射线相比，通常幅度较窄。

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