Quick Question about the Amnion

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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.)"

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

Thank you

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