Anatomy General obstetrics 28a73440 HcG is secreted by : A Trophoblast cells B Amniotic membrane C Fetal yolk sac D Hypothalamus High-Yield Explanation Synctiotrophoblasts are the principal site of protein and steroid hormones in pregnancy HcG is synthesized by synctiotrophoblast . Ref :Dutta Obs 9 e pg 53.