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Is it possible to transplant a brain and would it keep the memory? If not, what would be the prerequisite to transplant one?

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"Is it possible" has a carefully conditional "yes". Do we have the expertise or technology to do it now? No. One of the biggest difficulties is that nerve tissues (the connections between brain and rest of body) will take time to heal... time during which the brain cannot sufficiently give commands to the rest of the body to keep autonomic functions running.

Head transplants, however, have been "successfully" completed using monkeys. The monkey lived for sometime after the transplant, but eventually died. China has also been known to do a similar procedure with dogs.

Caution, this may be too explicit for some; I'm not sure ethics boards would allow it nowadays: Monkey Head Transplant

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In that star trek episode Bones did it once. lol –  shigeta Jul 29 '13 at 22:57
    
was the spinal cord reconnected in the head transplant? I think it was not? regenerating the nerve connections in a useful way remains a major goal in medical science. –  shigeta May 24 at 13:06
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