opthamology notes

Apr 16th, 2015
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Conjoined Twins FAQPrepared byDr. Tarek A. Abd El LatifCMEC,ManagerEMSConjoined TwinsWhat are conjoined twins?Conjoined twins aremonozygotic multiples that donot fully separate from eachother due to the incompletedivision of the fertilized ovum.The individuals will beconnected at certain points ofthe body, and may share tissue,organs or limbs.Conjoined Twins How does it happen?Monozygotic - also known as identical - twinsform when a single fertilized ovum splits intotwo embryos. This split can happen anytime afterfertilization; as more time passes, the twinsare more likely to share commonalities.If the split occurs more than twelve days postconception, the embryos do not fully divideand the twins may share body parts.Conjoined Twins How does it happen Like all Monozygotic twins,conjoined twins are always samesex (either both boys or bothgirls). It's a fairly rare occurrence.Exact statistics are not known,but are estimated to be about 1 in85,000 births. About 1 in 200 sets of identicaltwins are born conjoined. It is estimated that seventypercent of conjoined twins arefemale.Conjoined Twins What are Siamese Twins?Famed twins, chang and Eng Bunker, were born inSiam (now Thailand) in the early 1800's, althoughthey eventually settled in the United States. As they traveled the world, they became knownas "the Siamese twins."While they were the first conjoined twins whosemedi

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