A spasm or involuntary contraction of the muscles of the hand; an abnormal, uncontrolled movement of the hand.
From Greek 'cheir' (hand) and 'spasmos' (spasm, from 'span' meaning to draw or pull). A medical term describing a specific neurological or muscular disorder affecting hand control.
Chirospasm is related to the pianist's nightmare of 'writer's cramp'—repetitive strain injuries that cause hands to involuntarily clench, highlighting how the brain's control over hand muscles is surprisingly fragile despite how dexterous humans normally are.
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