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amniotic membrane (amnion, amniotic sac)

Fetal-derived membrane orginating from mesoderm (outer surface) & ectoderm (inner surface) encasing amionic fluid surrounding the fetus during gestation, becoming adherent the inner surface of the chorion (inner layer of the placenta).

Related

amniotic membrane rupture

General

membrane

References

  1. Wikipedia: Amnion http://en.wikipedia.org/wiki/Amnion