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The Endowment for Human Development
The Endowment for Human Development
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Germ Layers and Organ Formation


14 days

From The Biology of Prenatal Development.Buy Now

Script: udvikler sig indtil fødslen.

I løbet af cirka 2 1/2 uge har epiblasten dannet 3 specialiserede vævstyper eller kimlag, der hedder ektoderm, endoderm, og mesoderm.

Ektodermen er ophav til adskillige strukturer, herunder hjerne, rygmarv, nerver, hud, negle og hår.

Fra endodermen stammer åndedrætssystemets og fordøjelseskanalens indre overflader og dele af større organer såsom lever og bugspytkirtel.

Mesodermen danner hjerte, nyrer, knogler, brusk, muskler blodceller og andre strukturer.

All ages referenced to fertilization, not last menstrual period.
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