Abstract
The placenta is a temporary fetomaternal organ that sustains the growth and nutrition of the developing conceptus. Human beings have a villous hemo chorial placenta in which trophoblast is in direct contact with maternal blood (Fig. 3-1). Syncytiotrophoblast is the outer layer of trophoblast, which is in direct contact with this blood; it derives from the cytotrophoblast, which is most prominent in early pregnancy (Fig. 3-2).
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References
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Healy, D.L. (1987). Placental Endocrinology. In: Gold, J.J., Josimovich, J.B. (eds) Gynecologic Endocrinology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2157-6_3
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