Placentation 1 Flashcards
1
Q
What does trophoblast do when the embryo is implanted?
A
Trophoblast enzymes break down tissue of the endometrium to obtain nutrients for the embryo (not yet attached to the placenta)
2
Q
What is the outermost embryonic membrane made of?
A
trophoblast develops an inner layer- together layers develop into the chorion
3
Q
How is chronic villi developed?
A
Trophoblast sends out extensions into the endometrium
4
Q
When is chronic developed?
A
End of 4th week
5
Q
What does chronic villi develop?
A
irregular spaces called lacunae
6
Q
Where does lacunae form?
A
Around and between the villi and fills the maternal blood
7
Q
What does embryonic blood vessels do?
A
Extend through the connecting stalk, attaching the embryo to the developing placenta
