KINESIOL 2Y03 Lecture Notes - Lecture 6: Amniotic Sac, Zona Pellucida, Conjoined Twins
13 Feb 2018
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If they start splitting once they have become a blastocyst: will not share anything. If they split very late: they will have all things in common (including amniotic sac, when the embryo goes from the morula to the blastocyst, it is going out of the zona pellucida, it is hatching. If it splits after the hatching point: they will share the same chorion, but not the same amniotic sac if they split once they have been implanted, they will share all characteristics (amniotic sac as well) If they split around day 15: primitive streak is made around day 15, and the three germ layers are made, if the blastocyst splits at this point, they will be conjoined twins. 2: fetus creates its own blood, pluripotent stem cells are becoming blood cells. Space for the lumen of vessel (the inside of a vessel or tube: eventually we form full tubes endothelial tubes. The cavity is important in forming the heart.
