Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Tubercle of scaphoid & flexor retinaculum
INSERTION: Radial sesamoid of proximal phalanx of thumb & tendon of extensor pollicis longus
ACTION: Abducts thumb at metacarpophalangeal & carpometacarpal joints
NERVE: Recurrent (muscular) branch of median nerve(C8, T1) occasionally by ulnar nerve

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