Studies on the embryology of microchiroptera Part IV. An analysis of implantation and early development in Scotopbilous wroughtoni (Thomas)

Abstract

1. From the very early stages of development the orientation of the embryonic knob is antimesometrial. 2. The site of Implantation is clearly defined antimesometrially even before the embryo is actually attached. 3. The loss of the uterine epithelium cannot be attributed to the phagocytic activity of the trophoblast, though the trophoblast may ingest the degenerated epithelial ceil debris. Only later the trophoblast is seen to actually erode the uterine endometrium for estblishing placental relationships. 4. Amniogenesis occurs by cavitation. No distinction into primitive and definitive amnion can be made out, because they are one and the same; the delaitive amniotic cavity is differentiated when the amniotic cavity is formed. 5. The uterine glands do not undergo resorption, but are mechanically pushed towards the mesometrial side due to the widening of the antimesometrial part of the uterus.