Conjoined Twins: Two Individuals, One Body

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Conjoined Twins: Two Individuals, One Body

Conjoined twins are a rare form of identical twinning; one that carries many challenges with it, to affected twins and their families. From the time of birth conjoined twins must struggle to survive against physical and psychological difficulties. With the premium that current culture places on independence and individuality, conjoined twins fight to find their place in society, meanwhile demonstrating coexistence at the extreme. Parents and physicians are usually ultimately the responsible parties for deciding if this coexistence will continue. As will be discussed, the decision whether or not to separate conjoined twins remains tangled up in a web of argumentation, a debate that even the twins themselves may not be able to answer.

General Information about Conjoined Twins

Coined "Siamese twinning" after the birth of Chang and Eng in 1811 in Siam (who incidentally, were born to Chinese parents, not Siamese), conjoined twinning is the appropriate medical term for identical twins that are physically connected (Grosz, 1996). This condition is the result of a delay in the division of a single fertilized ovum. Most monozygotic (identical) twins form as a result of a split in the blastula between the 4th and 8th day after fertilization. These twins will share the same chorion but have separate amnions. Occasionally the spilt occurs after the 8th day and before the 13th day, creating twins that share the same chorion and amnion. However, if the split takes place after the 13th day when the embryonic disk has already begun to differentiate, the twins will share body parts in addition to sharing a chorion and amnion (Haaga, 2000). Studies have shown that conjoined twins have a muc...

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