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View Diary: VA Legislative Sentry: Have a Miscarriage, Go to JAIL? (231 comments)

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  •  Nonviable multiples I'll believe (none)
    but 'mirror-image' twins doesn't pass the laugh test.

    Kerry/Edwards: For a reality-based America

    by Em on Fri Jan 07, 2005 at 12:44:28 PM PST

    [ Parent ]

    •  I know (none)
      both types of identicals.  The set of mirror twins, one was a leftie, the other a rightie.  Their cowlicks were on opposite sides of their heads -- you could easily tell them apart, even though they were identical.

      The other set are almost impossible to tell apart, except by their parents, and both are righties.

      Franki "Long story short is a phrase whose origins are both complex and meandering" Grandpa Simpson

      by Frankenoid on Fri Jan 07, 2005 at 01:28:01 PM PST

      [ Parent ]

    •  Mirror twins: (none)
      here you are

      Almost one quarter of identical twins are "mirror" twins. This means that the twins will appear to be reflections of one another. One twin will be right-handed and the other will be left-handed. Internal organs and skeletal features will be on the opposite sides of the body. And, hair whorls will turn in opposite directions. One in four identical twins are mirror-image. Siamese twins show a high degree of mirror imaging.Mirroring is just as much a mystery to medical science as the cause of identical twins.

      I have a neuroscientist friend who is left-handed and has a right-handed twin.  We looked at their brains in an fMRI scanner. Language is left-lateralised in the right-handed twin, and right-lateralised in the left-handed twin.  One twin's hair spirals clockwise,  His brother has a double crown (two spirals in opposite directions), so not a perfect mirror.

      •  So it is... (none)
        Surfed a bit at PubMed... Monozygotic twins apparently sometimes have reversed-assymetry 'abnormalities' or mirror image traits. You sure learn something new every day around here. Fascinating.

        Kerry/Edwards: For a reality-based America

        by Em on Fri Jan 07, 2005 at 03:28:43 PM PST

        [ Parent ]

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