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It's probably an evolutionary adaptation to give us better grip in the water. People with nerve damage who can't feel their fingers also don't get pruny fingers, so there's clearly a "get pruny" signal coming from the brain or at least higher up in the nervous system.



I would assume that blood vessels contract to preserve heat, not to provide a better grip when swimming.


Nerves affect muscle movement and blood vessel growth.

do you really have better gripe with wrinkled fingers underwater?





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