在纺锤体迁移的过程中，一个无微绒毛但富含微丝的区域形成于其上方皮质区域。至此，卵母细胞的极性形成。
During spindle migration, an area enriched in actin microfilaments and devoid of microvilli begins to form in the cortex overlying the spindle, and prominent cortical polarity develops.
葡萄胎无血管的绒毛是十分大的。
组肾小管上皮细胞微绒毛膜上和细胞褶膜上的AKP呈少量褐色、细颗粒状，稀疏分布或无akp存在。
AKP on microvillus of group a and cell fold membrane of renal tubular epithelial cell appeared to have some brown granules, sparsely distributed. Sometimes there were no AKP on the above sites.
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