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An artificial model of a human embryo in a developmental stage corresponding to day 12. The upper elliptical structure is the part that will become an embryo including the amniotic sac above it; The lower structure is the yolk sac. The interface between the two structures is an essential element for embryonic development in humans. Both parts are surrounded by a layer of cells which will become the placenta

An artificial model of a human embryo in a developmental stage corresponding to day 12. The upper elliptical structure is the part that will become an embryo including the amniotic sac above it; The lower structure is the yolk sac. The interface between the two structures is an essential element for embryonic development in humans. Both parts are surrounded by a layer of cells which will become the placenta

An artificial model of a human embryo in a developmental stage corresponding to day 12. The upper elliptical structure is the part that will become an embryo including the amniotic sac above it; The lower structure is the yolk sac. The interface between the two structures is an essential element for embryonic development in humans. Both parts are surrounded by a layer of cells which will become the placenta

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