(medicine) A clinical manifestation of certain diseases of the nervous system characterized by involuntary trembling of the limbs brought on by voluntary movements, and ceasing on rest.
Intention tremor
| Sci-Tech Dictionary: intention tremor |
(in′ten·chən ′trem·ər)
| 5min Related Video: Intention tremor |
| Medical Dictionary: intention tremor |
n.
A tremor that occurs when a voluntary movement is made. Also called volitional tremor.
| World of the Mind: intention tremor |
A neurological term meaning an increase in tremor, especially of the arms and hands, when close to picking up or manipulating objects. It is associated with various neurological disturbances, and is probably due (in engineering terms) to increasing the gain of the servo-control systems of the limbs, mediated by the gamma-efferent system: a small error in position (for example, when picking something up with the hand) produces an over-correction so that the hand overshoots; this is over-corrected in its turn to produce an oscillation, or tremor. It is common, though not inevitable, in Parkinson's disease.
(Published 1987)
(Published 1987)
| Wikipedia: Intention tremor |
| Intention tremor | |
|---|---|
| Classification and external resources | |
| ICD-10 | G25.2 |
| ICD-9 | 333.1 |
| MeSH | D014202 |
Intention tremor is a dyskinetic disorder consisting of wide tremor during voluntary movements. The tremor worsens when a person is moving. It is the result of dysfunction of the cerebellum, in particular of the cerebellar hemispheres ("cerebro-cerebellum"), and is therefore part of the characteristic symptoms of cerebellar ataxia.
There is a very wide differential diagnosis of etiologies affecting the cerebellum, which include medical drugs, alcohol intoxication, focal lesions (including multiple sclerosis, stroke, and tumors). Primary cerebellar disease is relatively uncommon.
Intention tremor is not to be confused with a resting tremor as seen in Parkinson's disease.
External links
- http://www.mult-sclerosis.org/intentiontremor.html
- http://www.nationalmssociety.org/site/PageServer?pagename=HOM_LIB_sourcebook_tremor
- http://www.hmc.psu.edu/healthinfo/t/tremor.htm
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more |
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| World of the Mind. The Oxford Companion to the Mind. Second Edition. Copyright © Oxford University Press, 2004. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Intention tremor". Read more |
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