How many muscles does it take to give someone the middle finger?
It takes 42 muscles to frown, but 4 to extend your middle finger. The two muscles that keep the other fingers down are the flexor digitorum superficialis and the flexor digitorum profundus. The extensor digitorum extends the middle finger. The interosseous muscle allows the finger to be moved toward/away from your midline so it can stand straight up. Now the finger is extended. One more group of muscles may be used; lumbrical muscles in the hand helps you make fine adjustments in your finger position.
Updated on Wednesday, February 01 2012 at 03:57PM EST