Chorion is:-: (A) Trophoblast with mesoderm, (B) Trophoblast with splanchnopleuric mesoderm, (C) Trophoblast with somatopleuric mesoderm, (D) None of above
Answer is C. 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.