Question

what are the extra membranes formed during the development of embryo​

Answer 1

Answer:

The extra-embryonic membranes of the chick are four in number, the yolk-sac, the amnion, the serosa and the allantois. The yolk-sac is the first of these to make its appearance. The splanchnopleure of the chick instead of forming a closed gut, as happens in forms with little yolk, grows over the yolk surface.

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Answer 2

Answer:

During the second week of development, with the embryo implanted in the uterus, cells within the blastocyst start to organize into layers. Some grow to form the extra-embryonic membranes needed to support and protect the growing embryo: the amnion, the yolk sac, the allantois, and the chorion.