The fetus is surrounded by a fluid-filled cavity enclosed by which of these membranes?
a. amnion and chorion c. decidua basalis and decidua capsularis
b. cotyledons and funis d. ectoderm and endoderm
A
The outer fetal membrane is the chorion; the chorionic villi attached to the uterine wall form the placenta. The inner membrane, the amnion, slightly adheres to the chorion and forms the amniotic sac.
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