1. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
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How To Use amnion In A Sentence

  • Among the important changes of the vertebrate organisation that marked the rise of the first Amniotes from salamandrine Amphibia during this period the following three are especially noteworthy: the entire disappearance of the water-breathing gills and the conversion of the gill-arches into other organs, the formation of the allantois or primitive urinary sac, and the development of the amnion. The Evolution of Man — Volume 2
  • Associated with deposition of meconium pigment is a typical degenerative change of the amnionic epithelium consisting initially of heaping up of the cells, forming a multilayered amnion.
  • The new Williams credits Clark with the idea that AFE is similar to anaphylaxis and with the suggestion that the name amniotic fluid embolism (or "amnionic," as Williams puts it) is a misnomer. Chicago Reader
  • Aristotle's view, arguing that the female seed contrib - utes only nutrition and the allantois, while the male seed forms the other embryonic membranes (chorion, amnion) and bodily parts. Dictionary of the History of Ideas
  • A great step in evolution was implied in the origin of this ante-natal hood or foetal membrane and another one -- of protective significance -- called the amnion, which forms a water-bag over the delicate embryo. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
  • Conclusion Fresh amnion transplantation is an effective method to treat keratohelcosis.
  • In these three classes alone we find the remarkable embryonic membrane, already mentioned, which we called the amnion; a cenogenetic adaptation that we may regard as a result of the sinking of the growing embryo into the yelk-sac. The Evolution of Man — Volume 2
  • Its dorsal surface is covered by the amnion, while its ventral surface is bounded by the extra-embryonic celom, and is in contact with the vitelline duct and yolk-sac. I. Embryology. 11. Development of the Fetal Membranes and Placenta
  • Inside the egg are a series of fluid-filled membranes which permit the embryo to survive: the amnion, allantois, yolk sac, and chorion.
  • The one that is visible at the earliest stage of development is the amnion.
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