Extensor indicis muscle

Last revised by Daniel J Bell on 2 Aug 2021

The extensor indicis (EI) muscle is an accessory extensor of the 2nd digit. It is located in the deep layer of the posterior compartment of the forearm and its tendon passes through the 4th extensor compartment of the wrist. It is one of the extrinsic muscles of the hand.


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Cases and figures

  • Figure 1: extensor compartments of the wrist
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