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What is Chorion is:- and explain in detail?
Somatotropic mesoderm along with cytotrophoblast is called chorion. Somatopleuric layer lines the cyto-trophoblast and amnion; and splanchno pleuric layer covers the primary yolk sac. The extra embryonic coelom divides the extra embryonic mesoderm into somatopleuric and splanchnopleuric layers.