implantation and placenta Flashcards
1
Q
what embryological area does the yolk sac derive from ?
A
endoderm
2
Q
which embryonic layer does the chorion develop from
A
mesoderm and trophectoderm
3
Q
where does the allantois derive from
A
primitive gut
4
Q
what does each foetal membrane do ?
A
-amnion - symmetrical growth and protection
- yolk sac - regresses more important in reptile, birds , marsupials
-allantois - becomes umbilical cord
-chorion - becomes foetal contribution to placenta
5
Q
how long into pregnancy do endometrial cups form in the mare ?
A
day 50
6
Q
what do endometrial cups secrete?
A
ecg - equine chorion gonadotrophin
