The extensor indicis is one of the main finger extensor muscles in the hand.

Origin

Lower posterior shaft of ulna (below extensor pollicis longus) and adjacent interosseous membrane.

Insertion

Extensor expansion of index finger (tendon lies on ulnar side of extensor digitorum tendon).

Function

One of the main finger extensors.

With the complexity of all of the muscles and actions in the fingers, some are important in sports and bodybuilding

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