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| Description: On day 4 or 5, the morula enters the uterine cavity and is nourished by uterine milk, a glycogen-rich secretion from endometrial glands in addition to stored nutrients from the cytoplasm. At the 32-cell stage, the fluid now inside the morula, rearranges the blastomeres into a large, fluid filled blastocyst cavity (blastocoel). The mass is now called a blastocyst (still the same size as the original zygote). Picture Stats: Views: 164 Filesize: 811.57kB Height: 572 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40482 |