stackyFACTSEvolution is slowly trimming the fat, starting with a random arm tendon that hasn't been useful since we lived in trees.
Evolution is slowly trimming the fat, starting with a random arm tendon that hasn't been useful since we lived in trees. Around 14% of the global population is born without the palmaris longus muscle. You can check if you have it by touching your pinky to your thumb and flexing your wrist—if a band pops up, congratulations, you have a vestigial climbing muscle. For the rest of you, congratulations on being slightly more evolved and having an anatomically cleaner forearm.
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