The amnion, allantois, yolk sac, and chorion are fluid-filled membranes that allow the embryo to survive inside the egg. The amnion, which is filled with amniotic fluid and provides the embryo with a stable fluid environment, surrounds and protects the embryo.
What is an amniotic egg?
A water-retaining shelled egg with four membranes that allows reptiles, birds, and egg-laying mammals to complete their life cycles.
There are membranes present, namely:
- Extra-embryonic membranes: these are the membranes present in amniotic eggs that are not a part of the body of the developing embryo.
- Inner amniotic membrane: it usually surrounds the embryo.
- The chorion: it surrounds the embryo as well as yolk sac and aids in the exchange of gases.
- The amnion: it helps to protect the embryo from mechanical shock as well as supports hydration.
- The allantois: it usually stores nitrogenous wastes generated by the embryo as well as also facilitates respiration.
Thus, these are some membrane that is integral part of the amniotic egg.
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