Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Oblique head: base of 2nd and 3rd metacarpals, trapezoid and capitate. Transverse head: palmar border and shaft of 3rd metacarpal
INSERTION: Ulnar sesamoid then ulnar side of base of proximal phalanx and tendon of extensor pollicis longus
ACTION: Adducts carpometacarpal joint of thumb
NERVE: Deep branch of ulnar nerve (T1)

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