clasp-knife spasticity

clasp-knife spasticity
see under rigidity.

Medical dictionary. 2011.

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  • Clasp-knife response — refers to a stretch reflex with a rapid decrease in resistance when attempting to flex a joint, usually during a neurological examination. It is one of the characteristic responses of a upper motor neuron lesion. It gets its name from the… …   Wikipedia

  • clasp-knife rigidity — an exaggerated stretch reflex of skeletal muscles seen in spasticity and decerebrate rigidity, resembling the opening of a penknife or clasp knife; there is increased resistance to the extensors (induced by passive flexion of a joint), which… …   Medical dictionary

  • clasp-knife rigidity — see spasticity …   The new mediacal dictionary

  • Spasticity — A state of increased tone of a muscle (and an increase in the deep tendon reflexes). For example, with spasticity of the legs (spastic paraplegia) there is an increase in tone of the leg muscles so they feel tight and rigid and the knee jerk… …   Medical dictionary

  • spasticity — n. resistance to the passive movement of a limb that is maximal at the beginning of the movement and gives way as more pressure is applied. Also known as clasp knife rigidity, it is a symptom of damage to the pyramidal system in the brain or… …   The new mediacal dictionary

  • rigidity — 1. Stiffness or inflexibility. SYN: rigor (1). 2. In psychiatry and clinical psychology, an aspect of personality characterized by an individual s resistance to change. 3. In neurology, one type of increase in …   Medical dictionary

  • nervous system disease — Introduction       any of the diseases or disorders that affect the functioning of the human nervous system (nervous system, human). Everything that humans sense, consider, and effect and all the unlearned reflexes of the body depend on the… …   Universalium

  • effect — The result or consequence of an action. [L. efficio, pp. effectus, to accomplish, fr. facio, to do] abscopal e. a reaction produced following irradiation but occurring outside the zone of actual radiation absorption. additive e. an e. wherein two …   Medical dictionary

  • reaction — 1. The response of a muscle or other living tissue or organism to a stimulus. 2. The color change effected in litmus and certain other organic pigments by contact with substances such as acids or alkalies; also the property that such substances… …   Medical dictionary

  • Hypertonia — This article is about increased activity and resistance in muscles. For increased blood pressure, see Hypertension. Hypertonia Classification and external resources ICD 10 P94.1 ICD 9 …   Wikipedia

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