Demir R
Acta Anat (Basel). 1979;105(2):226-32. doi: 10.1159/000145125.
Mature placental material of full-term spontaneous births and 4-, 6-, 8- and 10-week-old placentas obtained from curettage cases were fixed in glutaraldehyde and osmium tetroxide for SEM examination. In young placentas, the ramifications of the chorionic villi start in the form of buds. The buds are transformed into tendrils with swollen extremities. These swellings resemble buds ready to bloom. The villi intertwine in different positions; both the villi and their tendrils are covered with dense layers of microvilli. In mature placentas, the surfaces of the chorionic villi and their ramifications are covered with microvilli. However, in comparison with the microvilli of young placentas, the microvilli here are less numerous and shorter. Invaginations were clearly visible on the surfaces of the villi; younger and newly budding microvilli, similar to those observed in young placentas, were seen in the invaginated regions. We had the impression that the mature placentas must regenerate in order to meet the increasing physiological requirements of the fetus.
从足月自然分娩获取的成熟胎盘组织以及从刮宫病例中获得的4周、6周、8周和10周龄胎盘，用戊二醛和四氧化锇固定，用于扫描电子显微镜检查。在年轻胎盘中，绒毛膜绒毛的分支以芽的形式开始。芽转变为末端肿胀的卷须。这些肿胀类似于即将绽放的芽。绒毛在不同位置相互缠绕；绒毛及其卷须都覆盖着密集的微绒毛层。在成熟胎盘中，绒毛膜绒毛及其分支的表面覆盖着微绒毛。然而，与年轻胎盘的微绒毛相比，这里的微绒毛数量更少且更短。在绒毛表面可见内陷；在内陷区域可见到与年轻胎盘中观察到的相似的较年轻和新萌生的微绒毛。我们感觉成熟胎盘必须再生以满足胎儿不断增加的生理需求。
