amniotic fold

amniotic fold
amniotic fold n any of the folds that consist of ectoderm and the outer layer of mesoderm, that arise from the extraembryonic blastoderm first at the head, then at the tail, and finally on each side, and that form the amnion and much of the chorion

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the folded edge of the amniotic membrane where it rises over and finally encloses the embryo.

Medical dictionary. 2011.

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