Quick Question about the Amnion

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galpinj
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Quick Question about the Amnion

Post by galpinj » Thu Jul 07, 2016 3:07 am

Hi everyone,

So I am pretty sure the amnion is formed by the epiblast in early gastrulation; however, I have found quite a few sources stating that it is the hypoblast which forms the amnion.

Wikipedia: "At the end of the second week, a primitive streak appears. The epiblast in this region moves towards the primitive streak, dives down into it, and forms a new layer, called the endoderm, pushing the hypoblast out of the way (this goes on to form the amnion.)"
https://en.m.wikipedia.org/wiki/Germ_layer

Just to confirm, does the amnion originate from the epiblast or hypoblast?

Thank you

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