Extensor indicis m

One of the extensor muscles of the forearm, the extensor indicis originates from the distal ulna and interosseous membrane, and inserts into the proximal phalanx of digit 2.  Its main action is to extend digit 2, but since it crosses the wrist it will also have some small contribution to wrist extension.  Its innervation is the same as all extensor muscles of the arm and forearm, the radial n.