Fate of Inner cell mass in embryo development...: (A) Placenta, (B) amniotic membrane, (C) Fetus, (D) Expelled out of developing embryo by 7 weeks
Answer is C. Cells of blastocyst differentiate into an outer trophoectoderm and inner cell mass. Just before implantation trophoectoderm fuher divided into: Cytotrophoblast & Syncytiotrophoblast Placenta and fetal membrances are derived from trophoectoderm. Inner cell mass helps in the development of embryo proper.