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Monochorionic twins
Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are ''dichorionic diamniotic''.〔 If the placenta divides, this takes place after the third day after fertilization.
==Amniocity and zygosity==
Monochorionic twins generally have two amniotic sacs (called Monochorionic-Diamniotic "MoDi"), but sometimes, in the case of monoamniotic twins (Monochorionic-Monoamniotic "MoMo"), they also share the same amniotic sac. Monoamniotic twins occur when the split takes place after the ninth day after fertilization.〔 Monoamniotic twins are ''always'' monozygotic (identical twins).〔(Pregnancy-Info -- > Monoamniotic Twins ) Retrieved on July 9, 2009〕 Monochorionic-Diamniotic twins are ''almost always'' monozygotic, with a few exceptions where the blastocysts have fused.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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