tremor


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Related to tremor: essential tremor

tremor

a minor earthquake

Tremor

 

an involuntary trembling of the entire body or parts of it. Tremors are characteristically rhythmic and stereotypic; usually they have a narrow range, most often affecting the fingers, eyelids, tongue, lower jaw, and head. In healthy subjects, tremors may be caused by muscular strain, emotional excitement, or exposure to cold. Pathological tremors may be symptoms of chronic alcoholism, thyrotoxicosis, neurotic states, acute infections, and such diseases as parkinsonism. The symptom is treated by treating the primary disease.

Eye tremor is an involuntary rapid movement of the eyeball in relation to the optic axis; its frequency is from 20 to 150 Hz, and its amplitude, from 5 to 15 seconds of arc. Visual perception itself depends to a significant degree on eye tremor, which produces constant changes in the illuminance of certain photoreceptors—that is, the photoreceptors located at the variously illuminated points of the retinal periphery. An image whose projection on the retina remains completely stable for more than a few seconds ceases to be perceived by the visual centers of the brain.

tremor

[′trem·ər]
(geophysics)
A minor earthquake. Also known as earthquake tremor; earth tremor.
(medicine)
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
References in periodicals archive ?
Panicked residents of affected cities and towns rushed out of their homes and offices when the tremors struck around noon.
Roughly 4% of 40-year-olds have essential tremor compared with about 20% of 90-year-olds.
Several residents reported feeling tremors and strange noises at about 1pm.
With one episode of tremor, you should not be concerned at all.
The first installation of Exablate Neuro in Taiwan represents a significant milestone in introducing this non-invasive treatment for essential tremor to the China, Taiwan and Hong Kong markets, said Peng Qiu, Country Manager of China at INSIGHTEC.
In Kota Kinabalu, people ran out of multi-storey buildings after tremors were felt in eastern Sabah.
According to the centre, the location of the tremor was 25 kilometres away from Masirah Island, east of Oman and a depth of 2.
Buried in the manuscript are clues that helped the researchers conclude that essential tremor plagued the Tremulous Hand.
Tremor is the most common movement disorder which is defined as a compulsively, rhythmic, shaking movement of a body part.
In today's article I will be concentrating on the benign essential tremor which is, to an extent, a non-serious condition that usually runs in families and may cause no problems at all.
Psychogenic tremor often increases when the limb is examined and reduces upon distraction, and also might be exacerbated with movement of other limbs.