chorionic membrane and chorionic cavity Flashcards
1
Q
what is the extraembryonic coelom? What lines it?
A
the chorionic cavity, which is lined by the chorionic membrane.
2
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.
3
Q
what forms the chorionic membrane?
A
extraembryonic mesoderm
4
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.
5
Q
to what does chorionic cavity expand?
A
to encompass the embryo except at the connecting stalk
6
Q
what is umbilical cord made of?
A
extraembryonic mesoderm
