Organization of Placenta
Summary :
Table of Contents
- Trophoblast ultrastructure
- Chorionic villi
- Placental cotyledons
- Breaks in the placental 'barrier'
- Placental size and weight
- The placenta at term
- Placental aging
- Conclusion
- Bibliography
Abstract
From the electron microscopic studies of Wislocki and Dempsey (1955), data were provided that permitted a functional interpretation of the fine structure of the placenta. There are prominent microvilli on the syncytial surface, corresponding to the "brush border" described by light microscopy. Associated pinocytotic vacuoles and vesicles are related to the absorptive and secretory placental functions. The inner layer of the villi-the cytotrophoblasts-persists to term, although often compressed against the trophoblastic basal lamina, and retains its ultrastructural simplicity.
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