How do prosthetics work? Like the really good arms with the individual moving fingers?

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Can you have an arm that’s like all cyborg, if you just have a nub/stump left?

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Most prosthetics with internal mechanisms work by using the muscles left behind after amputation in the upper limb. Electrodes are placed on them, and contraction of the muscle triggers the mechanism to move joints or extremities in the prosthesis. Others have toggle switches that can be operated by the amputee manually.

If you had no remaining muscles, there’s no way to currently get a prosthesis to function using brain signals (like regular muscles would). Research is ongoing, but it’s still early in development.