周缘细胞
- 网络parietal cell
周缘细胞-
孢原细胞进行平周分裂形成一个周缘细胞和一个造孢细胞。
The archesporium is divided into a parietal cell and a sporogenous cell , by the periclinal division .
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造孢细胞，大孢子母细胞和四分体时期，周缘细胞仅1层。
There is only one layer of parietal cells at the stage of sporogenous cell , megaspore mother cell and tetrad .
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孢原细胞平周分裂形成一个周缘细胞和一个造孢细胞，造孢细胞直接发育成大孢子母细胞，四分体大孢子呈线形排列，它们均可成为功能大孢子；
The sporogenous cell functioned directly as megaspore mother cell . The tetrad of megaspores was linear in arrangement , and every megaspore might be functional .
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13－16周胎脾中IDC开始定位于白髓的T细胞集落内和周缘，及B细胞集落的周边。
After 13-16 weeks . IDCs began to gather in and around T cell colony in white pulp .