This is what happens inside your body when you flex your fingers
Illustration by Mariana Ruiz Villarreal, released into the public domain
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Having never taken a medical anatomy course, I'd always assumed it was located entirely in the finger itself, just like the main muscles for flexing your elbow live in your upper arm.Turns out, this intuition is wrong. The main muscle for flexing your PIJs actually runs all the way up your arm. Called the flexor digitorum superficialis, it bends your fingers by contracting and bending them back toward itself.
This video (of unknown origin) which we saw Tweeted by the account How Things Work, illustrates the effect using a cadaver limb:I can't stop staring at it.
This is how you flex your fingers pic.twitter.com/BACT0bub5q- How Things Work (@ThingsWork) February 16, 2017