Knuckles in the back of the hand permit the fingers to move ahead and backward. They're very important in fight sports like wrestling and boxing. The ulnar nerve enters the hand underneath the superficial Component of the flexor retinaculum (in Guyon’s canal) after which it divides in to the deep https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/