Abstract
AbstractThe phyllostomid bat, Macrotus waterhousii, undergoes delayed development. Implantation occurs early in the nine‐month gestation, but the blastocyst remains relatively dormant until the sixth month when a chorioallantoic, hemodichorial placenta forms and a two and one‐half to three‐month growth pattern occurs leading to parturition.The barrier in the chorioallantoic placenta at first includes maternal capillary endothelium, but during the early part of the rapid growth phase the endothelium is replaced by blocks of syncytial trophoblast which penetrate the basal lamina. The basal lamina then apparently thickens and remains as the intrasyncytial lamina. Thus, the definitive barrier for maternal nutrients consists in order of passage of syncytial blocks, intrasyncytial lamina, syncytiotrophoblast, cytotrophoblast, fetal basal lamina and capillary endothelium.
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