Knuckles in the back of the hand allow the fingers to move forward and backward. They are really crucial in overcome sports like wrestling and boxing. The ulnar nerve enters the hand underneath the superficial part of the flexor retinaculum (in Guyon’s canal) after which it divides to the deep https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/