First Aid Embryo

Discussion in 'Step I' started by DireWolf, Apr 7, 2004.

  1. DireWolf

    DireWolf The Pride of Cucamonga
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    In the 2003 First Aid on p. 82 it says that monozygotic twins have 1 placenta, 1 chorion, and 2 amniotic sacs. Then it says that monozygotic twins develop 2 placentas (separate/fused), 2 chorions, and 2 amniotic sacs. Which is it supposed to be?
     
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  2. DarksideAllstar

    DarksideAllstar you can pay me in bud
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    I thought that this was determined by the day at which they split, but its been so long since Embryo that I cant remember.
     
  3. Kalel

    Kalel Membership Revoked
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    My peripheral read on this subject suggests that monozygotic twins can have either of those scenarios depending on when the splitting of the placenta occurs. 70% have monochorionic, diamniotic placentas, and the other 30% have dichorionic, diamniotic placentas.

    http://www.emedicine.com/ped/topic2599.htm
     
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