Fate of Inner cell mass in embryo development...
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.
Placenta
amniotic membrane
Fetus
Expelled out of developing embryo by 7 weeks
Obstetrics