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The yolk sac develops on the ventral aspect of the embryonic disc, beginning with the primary yolk sac formed by hypoblast cells at days 9-10. It evolves into a secondary yolk sac by the end of the second week and a definitive yolk sac by the third week, which plays crucial roles in gut formation, germ cell migration, and blood cell development. Ultimately, the definitive yolk sac and vitallo-intestinal duct gradually disappear during embryonic development.

Author

sardarsheri0987

Language

EN