End of the week of twos Buccopharyngeal Primary 2 major ce‖! masses_membrane Trophoblasts Maternal inner cell mas Amniotic . Trophoblasts cavity Cytotrophoblasts Syncytiotrophoblasts .Embryonic Cavities Extraembryonic somatopleure mesoderm (chorionic plate -Amniotic cavity Extraembryonic coelom Yolk sac ● Germ disc Epiblasts 2GCP89000303000CB00GOLC -hypoblastEnd of the Week of Twos •2 major cell masses –Trophoblasts –Inner cell mass •Trophoblasts –Cytotrophoblasts –Syncytiotrophoblasts •Embryonic Cavities –Amniotic cavity –Yolk sac •Germ Disc –Epiblasts –Hypoblasts