Home Forum Dictionary Articles Tutorials Books Directory Share your work


Edit page | Page history | Printable version

Dictionary » A » Amnion

Amnion

Amnion

(Science: anatomy, obstetrics) 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. 2. Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals). The amnion is a fluid filled sac that forms around a foetus; its main function is to provide protection to the foetus.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Re: Aminocentesis

... of genetic abnormalities and fetal infections, in which a small amount of amniotic fluid, which contains fetal tissues, is extracted from the amnion or amniotic sac surrounding a developing fetus, and the fetal DNA is examined for genetic abnormalities.

See entire post
by seders99
Fri May 01, 2009 3:09 am
 
Forum: Genetics
Topic: Aminocentesis
Replies: 1
Views: 2165

foetus position

... is open and there is exposure to air? I think this isn't the answer because I thing the foetus is already on the correct possition before the amnion is broken... I am not sure this is the right forum for this question so please direct me to the correct place. thanks.

See entire post
by Paragonidae
Sun Apr 27, 2008 8:57 pm
 
Forum: Physiology
Topic: foetus position
Replies: 2
Views: 4116

Evolution of reproduction: Mobility of cells

... require water(take note that external fertilization cannot occur on land - the eggs would dry up and sperm could not move). Also, the egg has an amnion, so there is no need for a water-dwelling larva. The organism develops entirely in that egg, the amnion being sorta like a fragment of the ancient ...

See entire post
by Heronumber0
Sat Jul 07, 2007 6:46 pm
 
Forum: Evolution
Topic: Evolution of reproduction: Mobility of cells
Replies: 6
Views: 4626

Evolution of reproduction: Mobility of cells

... require water(take note that external fertilization cannot occur on land - the eggs would dry up and sperm could not move). Also, the egg has an amnion, so there is no need for a water-dwelling larva. The organism develops entirely in that egg, the amnion being sorta like a fragment of the ancient ...

See entire post
by MrMistery
Mon Jun 25, 2007 8:51 am
 
Forum: Evolution
Topic: Evolution of reproduction: Mobility of cells
Replies: 6
Views: 4626

Extraembryonic Membranes

does anyone know exactly how the four membranes amnion yolk sac chorion, and allantois work to protect the embryo and egg?

See entire post
by vlc1500
Wed Mar 07, 2007 1:32 am
 
Forum: Zoology Discussion
Topic: Extraembryonic Membranes
Replies: 6
Views: 8139
View all matching forum results

This page was last modified 16:06, 3 February 2007. This page has been accessed 7,695 times. 
What links here | Related changes | Permanent link