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