During prenatal class, the childbirth educator describes the two membranes that envelop the fetus. The __________ contains the amniotic fluid, and the __________ is the thick, outer membrane
Fill in the blank with the appropriate word.
ANS: amnion; chorion
The embryonic membranes (chorion and amnion) are early protective structures that begin to form at the time of implantation. The thick chorion, or outer membrane, forms first. It develops from the trophoblast and encloses the amnion, embryo, and yolk sac. The amnion arises from the ectoderm during early embryonic development. The amnion is a thin, protective structure that contains the amniotic fluid. With embryonic growth, the amnion expands and comes into contact with the chorion. The two fetal membranes are slightly adherent and form the amniotic sac.
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