28. Human Development

From which germ layers do these membranes form, and what are their functions?

The yolk sac goes on to do all of the following EXCEPT:

Problems involving the formation of the chorion would affect 

(a) The embryo’s ability to produce blood cells

(b) The formation of limbs

(c) The embryo’s ability to derive nutrition from the mother

(d) Lung formation

(e) The urinary system

What are the four extra-embryonic membranes?