Bhiwgade D A
Department of Zoology, Institute of Science, Bombay, India.
Acta Anat (Basel). 1990;138(4):302-17. doi: 10.1159/000146960.
In the present study the comparative ultrastructure of the definitive chorio-allantoic placental barrier has been studied in considerable detail in six species of bats, representing six different families and both suborders of Chiroptera, by electron microscopy, and these species illustrate different kinds of interhaemal membranes met with among bats. The definitive chorio-allantoic placenta of Rousettus leschenaulti is haemodichorial, since the syncytiotrophoblast and cytotrophoblast layers are present to term. The fine structure of the placental barrier in the labyrinth of the definitive placenta of Rhinopoma hardwickei hardwickei is essentially endotheliomonochorial due to the presence of a single layer of cytotrophoblast and maternal endothelial cells. The placenta of Taphozous melanopogon, examined electron-microscopically in the present study, shows a thick maternal endothelium, a continuous interstitial membrane and the presence of a single layer of syncytiotrophoblast. The placenta of Megaderma comprises a typical endotheliochorial labyrinth and the presence of two layers of trophoblast. In Rhinolophus rouxi, the mature placenta during advanced pregnancy resembles that of Megaderma, its labyrinth containing large maternal capillaries with maternal endothelial cells and the two layers of trophoblast. Finally, the placental barrier of Hipposideros fulvus fulvus is haemodichorial due to the presence of two layers of trophoblast and the absence of maternal endothelial cells.
在本研究中，通过电子显微镜对六种蝙蝠的定型绒毛膜尿囊胎盘屏障的比较超微结构进行了相当详细的研究，这六种蝙蝠代表了六个不同的科以及翼手目的两个亚目，这些物种展示了蝙蝠中出现的不同类型的血胎屏障。鲁氏菊头蝠的定型绒毛膜尿囊胎盘是血双层绒毛膜的，因为合体滋养层和细胞滋养层持续存在至足月。哈氏埃及果蝠定型胎盘迷路中胎盘屏障的精细结构本质上是内皮单绒毛膜的，因为存在单层细胞滋养层和母体内皮细胞。在本研究中通过电子显微镜检查的黑髯墓蝠胎盘显示有一层厚厚的母体内皮、一层连续的间质膜以及单层合体滋养层的存在。皱唇犬吻蝠的胎盘包括一个典型的内皮绒毛膜迷路和两层滋养层。在鲁氏菊头蝠中，妊娠晚期的成熟胎盘类似于皱唇犬吻蝠的胎盘，其迷路包含有母体内皮细胞的大型母体毛细血管和两层滋养层。最后，中菊头蝠的胎盘屏障是血双层绒毛膜的，因为存在两层滋养层且没有母体内皮细胞。
