Hey guys.. i just had a quick question about placental formation. Barron's says it froms from the chorion, while Kaplan's says it forms from the allantois...which one is it!!! I believe its the chorion....any comments on this one?
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Chorion or Allantois?
Started by Pyari07
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Pyari07 said:
Couldn't you say it's either? I think they both join together to form the placenta, although if I had to choose between them, I would pick chorion.
Pyari07 said:
I don't think Kaplan says that. 😉 Barron's answer isn't quite right either. 😉
Richnator said:
Doesn't placenta have an embryonic portion and maternal portion?
I did not read deep into the topic concerning the origins of placenta development, however I do know the chorion lines the outer layer of an egg, towards the shell. Actually, according to Kaplan, "The blood vessels of the allantoic wall enlarge and become the the umbilical vessels, which will connect the fetus to the developing placenta." So I guess that serves as a connection and hopefully answers your question.
-Rich
-Rich
