chorionic membrane and chorionic cavity Flashcards by Laura Brickman

Q

what is the extraembryonic coelom? What lines it?

A

the chorionic cavity, which is lined by the chorionic membrane.

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Q

how does chorionic cavity form? when?

A

the cavity begins to form by coalescence of spaces within the extraembryonic reticulum and extraembryonic mesoderm at about day 12.

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Q

what forms the chorionic membrane?

A

extraembryonic mesoderm

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Q

what are theories about origin of extraembryonic mesoderm?

A

it is derived from either migration of cells from the epiblast or by delamination of hypoblast cells.

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Q

to what does chorionic cavity expand?

A

to encompass the embryo except at the connecting stalk

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Q

what is umbilical cord made of?

A

extraembryonic mesoderm

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