Abstract
The nonvillous parts of the placenta include the chorionic plate, cell islands, cell columns, placental septa, basal plate, marginal zone, and fibrinoid deposits in all parts of the organ (Figure 9.1). As they are not vascularized by either the maternal or fetal circulations, they do not participate in maternofetal exchange. Irrespective of their heterogeneous location and structure, the nonvillous parts of the placenta have the same basic components (Figures 9.2A,B): extravillous trophoblast, fibrinoid, and, only in some locations, decidualized endometrial stroma. These components structurally and functionally do not vary from one nonvillous part to another. Therefore, these basic tissues are considered first.
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Frank, H.G., Kaufmann, P. (2000). Nonvillous Parts and Trophoblast Invasion. In: Pathology of the Human Placenta. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-4199-5_9
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