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>because it increases overall blood supply But that's what I want explained why is more blood beneficial for a person's forearm? I don't feel like I am lackin

>because it increases overall blood supply But that's what I want explained why is more blood beneficial for a person's forearm? I don't feel like I am lacking blood flow during my daily tasks in life. Can "extra arm artery mutant guy" out-compete me in a specific task so critical it means his genes are more likely survive than mine are?

fleischhauf 6y ago
Replacement makes sense, your friend with extra artery will survive in case of a critical surgery and might have another kid while you'd die with no extra kid. Does not need to happen to you but on average. Your friend with better bloodflow might also have a stronger erection and therefore on average more kids (pulling this out of my ass obviously). You dont need to have any obvious disadvantages, on average it might still work better..
- learc83 6y ago
  If we're talking about a trend strong enough that most humans will have this trait in 80 years, then if natural selection is driving it, none of those advantages are great enough to explain that. The most likely answer is that natural selection isn't directly driving this specific trait.
- deleted 6y ago
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Someone 6y ago
I would guess extra blood flow could somewhat prevent people from suffering of cold fingers. I couldn’t find evidence for that, though. Worse, Wikipedia claims it’s easier to commit suicide by slashing your wrists if you have this artery (https://en.wikipedia.org/wiki/Median_artery https://en.wikipedia.org/wiki/Median_artery), and https://radiopaedia.org/articles/persistent-median-artery-of-the-forearm https://radiopaedia.org/articles/persistent-median-artery-of... says it can be a cause of carpal tunnel syndrome. I don’t see how either could be an evolutionary advantage.
- leephillips 6y ago
  More stamina when composing romantic emails → greater chance of reproduction.

fleischhauf 6y ago

Replacement makes sense, your friend with extra artery will survive in case of a critical surgery and might have another kid while you'd die with no extra kid. Does not need to happen to you but on average. Your friend with better bloodflow might also have a stronger erection and therefore on average more kids (pulling this out of my ass obviously). You dont need to have any obvious disadvantages, on average it might still work better..

learc83 6y ago
If we're talking about a trend strong enough that most humans will have this trait in 80 years, then if natural selection is driving it, none of those advantages are great enough to explain that. The most likely answer is that natural selection isn't directly driving this specific trait.
deleted 6y ago
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deleted 6y ago
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Someone 6y ago

I would guess extra blood flow could somewhat prevent people from suffering of cold fingers. I couldn’t find evidence for that, though. Worse, Wikipedia claims it’s easier to commit suicide by slashing your wrists if you have this artery (https://en.wikipedia.org/wiki/Median_artery https://en.wikipedia.org/wiki/Median_artery), and https://radiopaedia.org/articles/persistent-median-artery-of-the-forearm https://radiopaedia.org/articles/persistent-median-artery-of... says it can be a cause of carpal tunnel syndrome. I don’t see how either could be an evolutionary advantage.

leephillips 6y ago
More stamina when composing romantic emails → greater chance of reproduction.