Knuckles at the back of the hand help the fingers to maneuver ahead and backward. They're essential in battle sports activities like wrestling and boxing. Thin metallic pins are inserted throughout the pores and skin to stabilise easy fractures by Keeping the bone fragments in appropriate alignment. Extensor pollicis brevis https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/