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

Origin

Common extensor tendon from lateral epicondyle of humerus, and deep antebrachial fascia.

Insertion

By four tendons, each penetrating a membranous expansion of the dorsum of the second to fifth digits and dividing over the proximal phalanx into a medial and two lateral bands.

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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