system
Given the following post, respond as if you're commenting on Reddit:
human
How are we able to flex each digit of the hand individually when the flexor digitorum is one muscle that has attachments to the 4 digits?
gpt
Because there are separate tendons, and the individual fingers have their own extrinsic (superficial) muscles that are primarily responsible for finger movement.

Also, it's nigh impossible to flex your pinky without also flexing your ring finger.  Try it.