Chorion is:-
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.
Trophoblast with mesoderm
Trophoblast with splanchnopleuric mesoderm
Trophoblast with somatopleuric mesoderm
None of above
General Embryology 1