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What is the amniotic sac?

Diana Meeks
Diana Meeks on behalf of Sigma Nursing
Family Practitioner

The amniotic sac is a thin-walled pair of membranes that contains the fetus and amniotic fluid during pregnancy. The inner membrane, the amnion, contains the amniotic fluid and the fetus. The outer membrane, the chorion, contains the amnion and is part of the placenta. The amniotic sac has a capacity of 4 to 5 L at term. The wall of the sac extends from the margin of the placenta. The intact sac and its fluid provide for the equilibration of hydrostatic pressure within the uterus. During labor, the sac effects the uniform transmission of the force of uterine contractions to the cervix for dilation.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.