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