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| Description: The amnion forms from the roof of the amniotic cavity. Eventually, it surrounds the entire embryo and fills with amniotic fluid. Also on the 8th day, the exocoelomic membrane forms that, together with the hypoblast forms the yolk sac. On the 9th day, small spaces called lacunae form. By the 12th day, they fuse to form lacunar networks. Picture Stats: Views: 147 Filesize: 1.46MB Height: 869 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40489 |