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Not a doctor, but it was explained to me thus:

The peripheral nervous system can regrow nerve tissue but only if it has an intact pathway. So when they sew on a finger, if they can repair the myelin sheath, new nerves will grow down the old conduit at a rate of about an inch a month.

So they sew your finger on and you have to wait a few weeks to see if you're going to get any feeling back. That waiting would drive me nuts.



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