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allantois
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Definitions of allantois in various dictionaries:
noun - the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
ALLANTOIS - The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's co...
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| A membranous sac that develops from the posterior part of the alimentary canal in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals. Also called allantoid. |
| vascular fetal membrane that develops from the hindgut in embryonic higher vertebrates (reptiles, birds and mammals) |
| The fetal membrane lying below the chorion in many vertebrates, formed as an outgrowth of the embryo's gut. In birds and reptiles it grows to surround the embryo in eutherian mammals it forms part of the placenta. |
| Allantois description |
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The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handle liquid waste. * The allantois, along with the amnion and chorion (other extraembryonic membranes), identify humans and other mammals as well as reptiles, dinosaurs, and birds as amniotes. Of the vertebrates, only the anamniotes (fish and amphibians) lack this structure. |