Ulnar Claw Hand (Claw Hand): this is because of 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 due to a lesion of your deep branch of the ulnar nerve. These bones are https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/