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From Embryology

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Plate 4. Cat Fetus and Placenta

Fig. 13. Cat fetus measuring 6.8 cm surrounded by enraptured 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.


  • b. b. - Brown border.
  • ch. - Chorion.
  • ch. ep. - Chorionic epithelium.
  • e. I. - Ectodermal lamella.
  • endo. - Endothelium.
  • f. b. v. - Fetal blood-vessel.
  • G. c. - Giant cell.
  • m. b. v. - Maternal blood-vessel.
  • pl. - Placenta.
  • r. b. c. - Red blood-cell.
  • e. v. - Endodermal villi.
Links: Plate 1 | Plate 2 | Plate 3 | Plate 4 | Contributions No.51
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

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