Why can i move my ring finger and middle finger independently?

I recently learned that hand's have no muscle in them, it is simply tendon controlled by muscle in the forearm. However, i also recently learned that the ring finger and middle finger share a tendon (which is why, if u put your hands flat on the desk in a spider effect with your middle finger tucked in, you... show more I recently learned that hand's have no muscle in them, it is simply tendon controlled by muscle in the forearm. However, i also recently learned that the ring finger and middle finger share a tendon (which is why, if u put your hands flat on the desk in a spider effect with your middle finger tucked in, you can't move you're ring finger) so why can i move them independently when the middle finger isn't tucked in, because why would it matter if they share a same tendon?
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