Direct contribution of the cytotrophoblast to the syncytiotrophoblast in the diffuse labyrinthine endotheliochorial placenta of the bat


  • This investigation was supported by the National Institutes of Health, Child Health and Human Development grant 03391-02.


In the molossid bat, Tadarida brasiliensis cynocephala, there is a prominent diffuse endotheliodichorial placenta over the parietal area of the uterus prior to mid-gestation. During the neural groove stage the syncytium rapidly increases in quantity, and cells from the cytotrophoblast have been observed being contributed to the syncytium. The transitional cells become swollen and the plasma membranes between the syncytium and the transitional cell fuse, become porous, and rupture. The contents of the transitional cell then “flow” into the syncytial area.