Ulnar Claw Hand (Claw Hand): this is due to a lesion on the ulnar nerve. The MCP joints are hyperextended for that ring and little fingers because of the lack of the third and fourth lumbrical muscles due to a lesion from the deep branch on the ulnar nerve. It balances https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/