Extensor Pollicis Brevis Muscle
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
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The extensor pollicis brevis muscle is a short muscle originating from the radius to insert on the thumb and serves to straighten it out. Muscle extension occurs when the angle between the bones is increased - as when the forearm is aligned with the arm. An extensor, then, is any muscle serving to extend a bodily part (usually a limb) away from the body or when a digit is extended from its base.
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