Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Lower third of posterior shaft of radius and adjacent interosseous membrane
INSERTION: Over tendons of radial extensors and brachioradialis to base of proximal phalanx of thumb
ACTION: Extends metacarpophalangeal joint of thumb
NERVE: Posterior interosseous nerve (C7, 8)

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