Abstract
Blood cell production starts within the yolk sac during the third week of gestation, from where haematopoietic stem cells colonise the umbilical cord and aorta-gonad-mesonephros region and then the liver. By term, the bone marrow is the main site of blood cell production. Extramedullary haemopoiesis (EMH) is defined as blood cell production outside the bone marrow and, in the placenta, it happens within the villous stroma. Prolonged hypoxia and/or anaemia, usually associated with hydrops fetalis, may induce placental EMH, where a central macrophage provides the adequate microenvironment for maturation of the erythroid precursors.
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Peres, L.C. (2019). Extramedullary Haemopoiesis. In: Khong, T., Mooney, E., Nikkels, P., Morgan, T., Gordijn, S. (eds) Pathology of the Placenta. Springer, Cham. https://doi.org/10.1007/978-3-319-97214-5_22
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DOI: https://doi.org/10.1007/978-3-319-97214-5_22
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