Placentation 3 Flashcards
1
Q
What are the two additional membranes that form?
A
Yolk sac
Allantois
2
Q
When does the yolk sac form and what is the purpose?
A
Forms during 2nd
Produces blood cells
Gives rise to cells that will develop into sex cells
3
Q
When does allantois form and what is the purpose?
A
Formed during 3rd week
Produces blood cells and umbilical cord vessels
4
Q
Placenta forms from area where chorion contacts uterine wall which part consists of the embryonic part and maternal part?
A
Embryonic part consists of chorion and chronic villi
Maternal part consists of decidua basalis of uterine wall, where villi are attached
5
Q
What does the placental membrane do?
A
Separates embryonic blood from maternal blood
Performs exchange of nutrients, 02, wastes and co2 between embryonic and maternal blood
