In reply to Jack_F:
Flexing of the fingers is performed, primarily, by the flexor digitorum superficialis and profundus muscles; the body of these muscles are located in the forearm. Other muscles that act on the fingers are the palmar and dorsal interossei muscles and the lumbricals, located within the hand. Extensor digitorum, the body of which is also located within the forearm, helps to straighten the fingers. The little finger possesses a few other muscles, located within the hand, in addition to those mentioned.
So there are no muscles actually in the fingers themselves.