You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Extension at MCP joint is by and explain in detail?
(A) Extensor Digitorum # Extensor digitorum muscle actions include Extension of interphalangeal, metacarpophalangeal and wrist joints.> All Palmar interossei adduct the digit to which they are attached towards the middle finger + flex the digit at MCP joint & extend IP joints.> All Dorsal interossei abduct the digits away from the line of the middle finger + flex the digit at MCP joint & extend IP joints.> Lumbrical muscles flex the metacarpophalangeal joints, and extend the interphalangeal joints of the digit into which they are inserted.