Which Is an Action of the Extensor Digitorum

Multiple Choice

Which is an action of the extensor digitorum?

A) flexion of the hand at the wrist joint
B) flexion of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints
C) flexion of the arm at the glenohumeral joint
D) extension of fingers two through five at the metacarpophalangeal and proximal and distal interphalangeal joints