Twins, illustration

Twins, illustration

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Caption: Illustration of various types of uniovular gemellary pregnancies (true twins); these pregnancies result from a single egg and a single sperm, the fertilized egg divides. Depending on the date of division: Before 4 days: dichorionic pregnancy (2 placentas), diamniotic (two amniotic sacs). From 4 to 8 days: monochorionic pregnancy (1 placenta for 2 foetuses), diamniotic (two amniotic sacs). From 8 to 14 days: monochorionic pregnancy (1 placenta), monoamniotic (one amniotic sac). After 14 days: conjoined twins, 1 umbilical cord (Siamese).

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Keywords: amnion, amniotic cavity, amniotic liquid, anatomical, anatomy, artwork, comparison, diamniotic pregnancy, dichorionic pregnancy, embryo, embryology, foetus, gynaecology, human, identical twins, medicine, monoamniotic twin pregnancy, monochorionic twin pregnancy, obstetric, ovum, placenta, pregnancy, reproductive system, siamese, spermatozoa, twin pregnancy, twins

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