We examined the morphological features of the mitochondria and endoplasmic reticula of chorion laeve cytotrophoblasts from term human fetal membranes, and compared them with those of syncytiotrophoblasts and cytotrophoblasts from human placental villi. Ultrastructural enzyme histochemistry of cytochrome c oxidase and glucose-6-phosphatase were used as cytochemical markers for these intracellular organelles. Chorion laeve cytotrophoblasts possessed abundant endoplasmic reticula, and small mitochondria with a few cristae, which were characteristic of villous syncytiotrophoblasts rather than villous cytotrophoblasts. As for these organellar structures, statistical analysis confirmed similarities between chorion laeve cytotrophoblasts and villous syncytiotrophoblasts, but significant differences between laeve cytotrophoblasts and villous cytotrophoblasts. Though these two cytotrophoblasts originated from one common cell in early placental development, they exhibited quite different organellar morphology during placental/chorioamniotic differentiation. Considering previous data, we concluded that chorion laeve cytotrophoblasts were metabolically active cells, similar to villous syncytiotrophoblasts, performing many functions in fetal membrane physiology.

中文翻译：

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绒毛膜绒毛膜滋养层细胞的线粒体和内质网的形态：类似于绒毛合体滋养层而不是绒毛滋养层。

我们检查了足月人胎膜的绒毛膜绒毛膜滋养层细胞线粒体和内质网的形态特征，并将其与人胎盘绒毛的合胞体滋养层细胞和滋养层细胞进行了比较。细胞色素c氧化酶和葡萄糖6磷酸酶的超微结构酶组织化学被用作这些细胞内细胞器的细胞化学标记。绒毛膜层绒毛滋养层细胞具有丰富的内质网和小的线粒体，带有少量cr，这是绒毛合体滋养层细胞而不是绒毛滋养层细胞的特征。对于这些细胞器结构，统计分析证实了绒毛膜绒毛滋养细胞和绒毛合体滋养细胞之间的相似性，但单株绒毛滋养细胞与绒毛绒毛滋养细胞之间存在显着差异。尽管这两种滋养细胞起源于胎盘发育早期的一个共同细胞，但它们在胎盘/绒毛膜羊膜细胞分化过程中表现出完全不同的细胞器形态。考虑到以前的数据，我们得出结论，绒毛膜细胞绒毛滋养细胞是代谢活跃的细胞，类似于绒毛合体滋养滋养细胞，在胎儿膜生理中发挥许多功能。