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a type of increased muscle tone due to an extrapyramidal lesion in which pathologic resistance to passive extension of a joint is constant throughout the range of motion. Should be contrasted with clasp-knife spasticity (q.v.).
a state of stiffness and inflexibility that remains uniform throughout the range of passive movement, associated with diseases of the basal ganglia.
lead-pipe rigidityinitial resistance followed by gradual compliance, on passive limb movement; characteristic of Parkinson's disease
lead-pipe ri·gid·i·ty(ledpīp ri-jidi-tē)
Symptom comprising increased muscle tone due to an extrapyramidal lesion in which pathologic resistance to passive extension of a joint is constant throughout the range of motion.
inflexibility or stiffness.
increased tension in the extensor of a joint when it is passively flexed, giving way suddenly on exertion of further pressure; seen especially in upper motor neuron disease.
tension in a muscle that gives way in little jerks when the muscle is passively stretched.
posture adopted when the rigidity of the limb is maintained equally throughout the passive flexion.
the state of immobility generated in female animals, especially those in estrus, when they make physical contact with a male.