透射电镜观察显示培养的上皮具有极性，表面有微绒毛，细胞间紧密连接及细胞间糖原沉积。

Transmission electron microscope indicated a polarized columnar epithelium in monolayer with basally nuclei and tight junction.

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绒毛间质内的间充质细胞呈现功能活跃状态，含丰富的粗面内质网和发达的高尔基复合体。

And (4) in the stroma of villi, mesenchymal cells were abundant in rough endoplasmic reticulum and well developed Golgi complex. Mesenchymal cells were markedly functionally active.

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