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Definition: muscle of posterior (extensor) compartment of forearm; origin, posterior surface of middle of shaft of ulna; insertion, dorsal aspect of base of distal phalanx of thumb; action, extends distal phalanx of thumb; nerve supply, radial (posterior interosseous).
Synonym(s): musculus extensor pollicis longusTA, long extensor (muscle) of thumb, musculus extensor longus pollicis
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