Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Upper posterior surface of ulna and middle third of posterior surface of radius and interosseous membrane between
INSERTION: Over tendons of radial extensors and brachioradialis to base of 1st metacarpal and trapezium
ACTION: Abducts and extends thumb at carpometacarpal joint
NERVE: Posterior interosseous nerve (C6, 7)

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