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Extra-embryonic mesoblast
Extra-embryonic reticulum
Primary umbilical vesicle
Cytotrophoblast |
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Lacunae in the reticulum
Hypoblast
Heuser´s membrane between hypoblast and mesoblast cells |
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Fig. 9, Fig. 10
Extra-embryonic mesoblast cells, derived from epiblast cells, grow into the extra-embryonic reticulum. Beginning of the reticular vacuole formation that will form the future chorionic cavity.
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