Javascript is disabled. Please enable javascript to view images and advanced functionality
Social MediaSummary
Did You Mean: Amnion nodosumAmnion (Gap Cycle)

Add research to Amnion by attaching materials such as relevant webpages, videos, images or pdf documents here

0%

Amnion on Social Media

Amnion Summary

Amnion

For the alien race in Stephen R. Donaldson's The Gap Cycle, see Amnion (Gap Cycle).The amnion is a membrane that closely covers the embryo when first formed. It fills with the amniotic fluid which causes the amnion to expand and become the amniotic sac which serves to provide a protective environment for the developing embryo or fetus. The amnion, along with the chorion, the yolk sac and the allantois form a protective sac around the embryo. In birds, reptiles and monotremes, the protective sac is enclosed in a shell. In marsupials and placental mammals, it is enclosed in a uterus. The term amnion is from Ancient Greek ἀμνίον 'little lamb', diminutive of ἀμνός 'lamb'. it is cognate with the English verb 'yean', bring forth young (usually lambs). The amnion is a feature of the vertebrate clade Amniota, which includes reptiles, birds, and mammals. Amphibians and fish are not amniotes and thus lack the amnion. The amnion stems from the extra-embryonic somatic mesoderm on the outer side and the extra-embryonic ectoderm or trophoblast on the inner side.

Website Menu