Zusammenfassung
Bei der raschen Entwicklung und dem großen Wachs-tumsschub, den der Keim in seinen frühen Entwicklungsstadien (Stadium 6 und 7, Tabellen 5.1 und 9.1) ausführt, stellt sich das Problem der Ernährung. Der Stofftransport an die einzelnen Zellen des implantierten Keimes heran und der Abtransport von Stoffwechselprodukten können bald nicht mehr allein durch Gewebsdiffusion (histotrophe Ernährung) gewährleistet werden. Biologisch sinnvoll beginnt deshalb bereits im Stadium 5 die Umstellung auf die hä-matotrophe Ernährung mit der Zirkulation mütterlichen Blutes durch die Trophoblastlakunen. Im Stadium 9 beginnt die Bildung eines embryonalen Transportsystems, das aus dem embryonalen Gefäßnetz und dem Blut besteht.
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Prindull, G. (1990). Blut. In: Hinrichsen, K.V., et al. Humanembryologie. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-07815-0_14
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