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| Description: About 8 days after implantation, the trophoblast develops into the syncytiotrophoblast and cytotrophoblast. At around 8 days, the embryoblast also develops into two layers: the hypoblast (primitive endoderm) and epiblast (primitive ectoderm). Cells of these structures form a flat disc called the bilaminar embryonic disc. The amniotic cavity forms from the epiblast. Picture Stats: Views: 186 Filesize: 1.14MB Height: 900 Width: 1196 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40488 |