Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Flexor retinaculum and tubercle of trapezium
INSERTION: Whole of radial border of 1st metacarpal
ACTION: Opposes (medially rotates and flexes ) carpometacarpal and metacarpophalangeal joints of thumb
NERVE: Recurrent (muscular) branch of median nerve (C8,T1) (may also be from deep branch of ulnar nerve (T1))

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