Muscle origin: Posterior surface of middle third of ulna and interosseus membrane (Extensor pollicis longus). Posterior surface of distal third of radius and interosseus membrane (Extensor pollicis brevis)
Muscle insertion: Posterior aspect of base of distal phalanx of thumb (Extensor pollicis longus). Posterior aspect of base of proximal phalanx of thumb (Extensor pollicis brevis)
Muscle function: Wrist extension, extension of Metacarpophalangeal and interphalangeal joint of thumb (Extensor pollicis longus). Extension of Carpometacarpal and metacarpophalangeal joint of thumb, and control of Radius (Extensor pollicis brevis)
Nerve innervation: C7-8 (Lovett reactor T10-11)
Myofascial lines:
Primary inhibatory muscles
Related joints: Radioulnar, Carpometacarpal, Metacarpophalangeal and interphalangeal joint of thumb
Organ relationship: Symp T1-10 / Parasymp (CX (Vagus)
Synergists:
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