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