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Hypertonia is an upper motor neuron dysfunction marked by an abnormal increase in tightness of muscle tone and a reduced ability of a muscle to stretch (i.e. an increased stiffness). Hypertonia is usually a feature of spasticity in particular muscles. These features are common in cerebral palsy.
- "The Clasp Knife Phenomenon" at mcg.edu
Diseases of myoneural junction and muscle / neuromuscular disease (G70–G73, 358–359)