Horse-shoe Shaped Primitive Cavity in the Embryo? - USMLE Forums
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Old 04-28-2013
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Zygote Horse-shoe Shaped Primitive Cavity in the Embryo?

I am not getting how primitive body cavity in embryo is horse-shoe shaped .. can anyone please help?? :/
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Old 04-28-2013
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Wink Try this.

After the formation of the three germinal layers at the end of the third week, the developing embryo folds in two planes. First, a lateral folding that places the endoderm internally and ectoderm externally. Then there's a cranio-caudal folding that produces the horseshoe-shaped embryo you speak of.
Hope this helps.
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