Oduor-Okelo D
Placenta. 1984 Sep-Oct;5(5):433-42. doi: 10.1016/s0143-4004(84)80024-7.
The ultrastructure of the cane rate chorio-allantoic placenta has been studied. In its thinnest regions the interhaemal membrane is composed of a single layer of syncytiotrophoblast, a common basal lamina, and the fetal capillary endothelium. Hence this is a haemomonochorial placenta. The cytotrophoblastic cells show many mitotic figures but they are never seen directly bounding the maternal blood spaces. The syncytiotrophoblast of the spongy zone is rich in dilated cisterns of granular endoplasmic reticulum and is also characterized by many 'intrasyncytial canaliculi'. The subplacenta consists of both cytotrophoblast and syncytiotrophoblast. The syncytiotrophoblast has numerous short microvilli projecting into the intercellular spaces, granular endoplasmic reticulum, a well-developed Golgi complex, and numerous electron-dense granules of uniform size. The intercellular spaces or lacunae contain a precipitate of moderate electron density which is similar in texture to the intracellular precipitate in the 'brush border' region of the syncytiotrophoblast. The similarities between the ultrastructure of the cane rat placenta and those of the guinea pig and chinchilla are discussed.
对甘蔗鼠绒毛膜尿囊胎盘的超微结构进行了研究。在其最薄的区域，血胎屏障由单层合体滋养层、共同的基膜和胎儿毛细血管内皮组成。因此，这是一种单绒毛膜胎盘。细胞滋养层细胞显示出许多有丝分裂图像，但从未直接观察到它们与母体血腔相邻。海绵区的合体滋养层富含扩张的粗面内质网池，其特征还在于许多“合体细胞内小管”。胎盘小叶由细胞滋养层和合体滋养层组成。合体滋养层有许多短微绒毛伸入细胞间隙，有粗面内质网、发育良好的高尔基体和许多大小均匀的电子致密颗粒。细胞间隙或腔隙含有中等电子密度的沉淀物，其质地与合体滋养层“刷状缘”区域的细胞内沉淀物相似。讨论了甘蔗鼠胎盘与豚鼠和毛丝鼠胎盘超微结构之间的相似性。
