Ulnar Claw Hand (Claw Hand): this is because of a lesion with the ulnar nerve. The MCP joints are hyperextended for the ring and minor fingers a result of the lack of the 3rd and fourth lumbrical muscles as a result of a lesion with the deep branch on the ulnar https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/