The extensor pollicis brevis is a forearm muscle that helps extend the thumb at the metacarpophalangeal joint. It plays a key role in thumb movement, particularly in actions like releasing a grip or repositioning the thumb. It also assists in thumb stabilization during precise tasks.
From Latin: extensor means "to stretch," pollicis means "of the thumb," and brevis means "short," indicating its function and shorter length compared to its counterpart, the extensor pollicis longus.
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