Ulnar Claw Hand (Claw Hand): this is due to a lesion from the ulnar nerve. The MCP joints are hyperextended to the ring and small fingers due to the loss of the 3rd and fourth lumbrical muscles because of a lesion with the deep department with the ulnar nerve. The service https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/