Extensor indicis

Extends 2nd digit (enabling its independent extension). Helps extend hand at wrist.

extensor indicis action

Posterior surface of distal 1/3 of ulna and interosseous membrane

extensor indicis origin

Posterior interosseous Nn. (C7, C8), continuous branch of Radial Nerve's deep branch.

innervation of extensor indicis

Extensor expansion of 2nd digit

insertion of extensor indicis