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Extensor indicis muscle (anatomy)

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Extensor indicis is one of the deep muscles on the extensor aspect of the forearm. It originates from the:

  • extensor surface of the ulna at a level between the middle and distal thirds
  • adjacent interosseous membrane

It inserts into the extensor expansion of the index finger. At this point, it lies to the ulnar side of extensor digitorum.

It acts to:

  • extend all the joints of the index finger
  • assist wrist extension

Extensor indicis is innervated by the posterior interosseous nerve (C7,C8).

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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