What is bilaminar germ disc? When and how it is formed? What changes take place in trophoblast during second week of development?
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In week 2 of implantation, the trophoblast penetrates deeper into the endometrium, and the blastocyst changes morphologically. The inner cell mass produces a bilaminar embryonic disk composed of epiblast (future embryonic ectoderm and mesoderm) and embryonic endoderm.
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