File:Wislocki1920 plate 4.jpg
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Plate 4
Fig. 13. Cat fetus, measuring 6.8 cm., surrounded by unruptured membranes, showing the coloration of the placenta and chorion after repeated injection of trypan-blue into the maternal circulation. Note that the chorion over the poles of the fetus is unstained. The allantoic and amniotic fluids do not contain a trace of dye and the fetus is unstained.
Fig. 14. Placenta of cat, nearly full term, after repeated injection of trypan-blue into the maternal blood stream, showing the distribution of dye in the chorionic epithelium.
Fig. 15. Placenta of a vitally stained cat, nearly full term, showing several multimiclear giant cells of the chorionic ectoderm filled with particles of trypan-blue.
Fig. 16. Section of the "brown border" of the placenta of a cat, nearly full term, showing the absorption of erythrocytes and of trypan-blue by the chorionic epithelium.
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