What is the difference between trophoblast and blastoderm?

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FredericChopin
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In a blastula, the outer layer of blastomere cells is called the blastoderm, but I have also seen it been called a trophoblast. What is the difference? Have a look at the pictures I uploaded.

Thank you.
 

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Thank you Greg.

Unfortunately, I am still looking for answers. I don't have any new information nor have I made any new conclusions. :(