Apr 6, 2014
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Amnion is the tough fibrous membrane which lines the cavity of the womb (UTERUS) during pregnancy, and contains between 0·5 and 1 litre (1–2 pints) of fluid in which the EMBRYO floats. It is formed from the ovum (egg) along with the embryo, and in labour the part of it at the mouth of the womb forms the ‘bag of waters’. (See PREGNANCY AND LABOUR.) When a child is ‘born with a CAUL’, the caul is a piece of amnion.

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Medical Dictionary

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