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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Monoamniotic twins ： ウィキペディア英語版 Monoamniotic twins Monoamniotic twins are identical twins that share the same amniotic sac within their mother’s uterus.〔(Pregnancy-Info -- > Monoamniotic Twins ) Retrieved on July 9, 2009〕 Monoamniotic twins are always identical, always monochorionic and are usually termed Monoamniotic-Monochorionic ("MoMo") twins.〔 They also share the placenta, but have two separate umbilical cords. Monoamniotic twins develop when an embryo does not split until after formation of the amniotic sac,〔 at about 9-13 days after fertilization. Monoamniotic triplets or other monoamniotic multiples〔(MoMo Twins; Monochorionic Monoamniotic Twins ) By Pamela Prindle Fierro, About.com. Retrieved on July 9, 2009〕 are possible, but extremely rare.〔 Other obscure possibilities include multiples sets where monoamniotic twins are part of a larger gestation such as triplets, quadruplets, or more. ==Occurrence== Monoamniotic twins are rare, with an occurrence of 1 in 35,000 to 1 in 60,000 pregnancies,〔 corresponding to about 1% of twin pregnancies.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monoamniotic twins」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.