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Nah Neil it makes sense. And its only 9pm ya dummy!So let's think of it this way.I chop off one of my toes. And one of my fingers.I chuck the toe away. And with surgery, stick my finger in replacement of the toe. Now, if I pinch the finger/toe which is on my toe, will it feel like if it hurts on the foot or the hand?Definitely the foot, because it is no longer part of your hand anymore, even though it was. It now shares the same nerves as your old toe had, because when you had a surgery or something, the nerves are joined. So you wouldn't feel pain on your hand, but still on your toe, even though it was originally a finger.
There are two different issues.Firstly, there is, as Sean mentioned, then issue of where are the nerves connected.Secondly, there is the adaptability of the brain. After all, my brain is perfectly aware that the relationship of my belly button and various other parts of me has shifted over my lifetime - bits have drifted further away from each other totally without the surgeons knife to help.An indication of how adaptable the brain is can be seen with that oft recounted experiment where people were given prisms to wear that made the world look upside; and after an initial confusion, the brain quickly compensated for the prisms, so the subjects could still tell exactly where things were without even being aware of the distorting effects of the prism (and in fact, when the prisms were removed, they were initially confused and thought the world to be upside down, until they had acclimatised to the world without the prisms).Thus, even if the nerves were wired up differently, the brain will begin to rewire itself to compensate for changes in external wiring.