Lexic.us

Definition of Amnion

1. Noun. Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals).

Definition of Amnion

1. n. A thin membrane surrounding the embryos of mammals, birds, and reptiles.

Definition of Amnion

1. Noun. (anatomy) the innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended. ¹

¹ Source: wiktionary.com

Definition of Amnion

1. a membranous sac enclosing an embryo [n -NIONS or -NIA] : AMNIC, AMNIONIC, AMNIOTIC [adj]

Medical Definition of Amnion

1. A thin but tough extraembryonic membrane of reptiles, birds and mammals that lines the chorion and contains the foetus and the amniotic fluid around it, in mammals it is derived from trophoblast by folding or splitting. (05 Feb 1998)

Lexicographical Neighbors of Amnion

Literary usage of Amnion

Below you will find example usage of this term as found in modern and/or classical literature:

1. Anatomy: Descriptive and Surgical by Henry Gray (1897)
"The amnion is the membrane which immediately surrounds the <fo. It is of small size at first, but increases considerably toward the middle Folie amnion or ..."

2. Science by American Association for the Advancement of Science (1901)
"In the sauropsida and in some mammals, as is well known, the amnion arises in quite ... 2, 3 and 4, diagrams of successive stages of formation of the amnion ..."

3. A Text-book of Zoology by Thomas Jeffery Parker, William Aitcheson Haswell (1921)
"single cavity—the primitive amniotic cavity, but this has only a temporary existence, the amnion arising later by the formation of a series of folds. ..."

4. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1845)
"Dropsy of flie amnion.—Dr. ROBERT LEE relates in his '•' Clinical ... In the simple form of dropsy of the amnion, where the quantity of fluid is not ..."

5. Quain's Elements of Anatomy by Jones Quain, Edward Albert Sharpey-Schäfer, George Dancer Thane (1890)
"It will be seen from the manner in which the true and false amnion are formed by ... In the false amnion the epiblast becomes the outer layer ; in the true ..."

6. The Development of the Chick: An Introduction to Embryology by Frank Rattray Lillie (1908)
"The connections of the amnion with the chorion, and later with the ... Muscle fibers appear in the walls of the amnion on the fifth or sixth day and ..."

7. Report of the Annual Meeting (1899)
"On the Phylogeny of the Arthropod amnion. By ARTHUR WILLEY, D.Sc. Land., Hon. MA Cantab. Until recently the formation of the amnion of the higher ..."

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