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| == Conceptus Cavities Week 2 and Week 3 ==
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| | <wikiflv width="214" height="220" autoplay="true" position="left">Chorion 001.flv|File:Chorion 001 icon.jpg</wikiflv>
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| | Animation shows the events following implantation and focuses on changes in the the spaces surrounding the embryonic disc, the extraembryonic coelom. The blastoceol cavity is converted into two separate spaces: the yolk sac and the chorionic cavity. The third space lies above the epiblast, the amniotic cavity.
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| '''blue''' - epiblast layer
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| '''yellow''' - hypoblast layer
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| '''red cells''' - extraembryonic mesoderm layer
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| '''green''' - trophoblast layer
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| '''red spaces''' - blood-filled spaces, maternal lacunae
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| '''white cells''' - (left) endometrial gland (right) endometrial epithelium
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| :[[Media:Chorion_001.mov|Quicktime version]]
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| |}
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