Illustration of the foetal surface of the placenta. The two umbilical arteries (red) pass from the foetus to the placenta and are depleted in oxygen and nutrients. The umbilical vein (blue) supplies oxygenated and nutrient-rich blood from the placenta to the foetus. From Kollmann, J. (1907) Handatlas der Entwicklungsgeschichte des Menschen, vol 1, Fig. 173. G. Fischer, Jena.
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達志影像
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