Plate 13.258 Placenta
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Rhesus monkey, 10% formalin, H. & E., 3.5 x.
The components of the placenta are seen at low magnification in this plate. The maternal contribution is the decidua basalis. This is the part of the endometrial mucosa lying beneath the embryo between the embryo and the myometrium. The fetal contribution is the chorionic plate and its villi. The chorionic plate is a portion of the chorionic sac about the embryo. Chorionic villi arise from the chorionic plate and lie in the spaces through which maternal blood circulates. Many villi are floating; others attach to the decidua basalis as anchoring elements. Villi receive their blood from the umbilical arteries and drain into the umbilical vein. Outside the chorionic plate, note the amnion that lines the amniotic cavity containing the umbilical cord. The embryo is not seen.
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