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a minor earthquake
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A minor earthquake. Also known as earthquake tremor; earth tremor.
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In conclusion, this case report presents the pwHE with disabling asymmetric kinetic, postural and resting tremor of upper extremities, not described so far, which along with MRI abnormalities regressed after LT and liver function normalization.
Conversely, PD is more likely to be considered when global bradykinesia, narrow gait base, reduced arm swing, responsiveness to cues, asymmetric rigidity, bradykinesia, resting tremor, or camptocormia are observed.
[sup][4] The mRT patients must meet the following criteria: (1) Pure or predominant resting tremor; (2) no sign of bradykinesia, rigidity, or abnormal gait and posture; and (3) tremor ≥2 years.
You will hear a sound reminiscent of a helicopter, as muscles quiver at a high frequency Distractibility Asking the patient to perform a cognitive task (such as saying the months of year backwards or doing serial 7 subtractions) exacerbates an organic tremor (especially the resting tremor of Parkinson's disease) but reduces a psychogenic tremor Entrainment Tap a rhythm with your hands and ask the patient to follow it by tapping an unaffected limb.
Acetylcholine (ACh) is an essential part of this pathway, and in the absence of dopamine, ACh activity is increased--possibly contributing to the development of resting tremor in PD.
The cardinal symptoms of PD are resting tremor, rigidity, bradykinesia, and postural instability.
Parkinson's disease (PD), a neurodegenerative disorder, is characterized by the selective degeneration of the nigrostriatal dopaminergic neurons, continuing or permanent deficiency of dopamine, accretion of an abnormal form of alpha synuclein in the adjacent neurons, and dysregulation of ubiquitin proteasomal system, mitochondrial metabolism, permeability and integrity, and cellular apoptosis resulting in rigidity, bradykinesia, resting tremor, and postural instability.
It is different from the resting tremor usually associated with Parkinson's.
Primary motor symptoms will affect the majority of patients with PD; they include a resting tremor, bradykinesia, rigidity, and postural instability.
Some disease features showed up significantly more often among those with GBA mutations than in those without mutations, such as asymmetric onset, bradykinesia, resting tremor, rigidity, and cognitive changes.
The decrease in dopamine results in one or more of the classic signs of Parkinson's disease that includes, resting tremor on one side of the body, generalized slowness of movement, stiffness of limbs, and gait or balance problems.
PD is generally characterized by four primary clinical motor symptoms: resting tremor. bradykinesia, rigidity and postural instability; however, resting tremor may be absent and postural instability may occur late in the course of the disease.