involuntary muscle


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involuntary muscle

n.
Muscle that is not controlled by individual volition, including smooth muscle and cardiac muscle.

involuntary muscle

Smooth muscle, usually within an organ or blood vessel, that contracts under the influence of unconscious processes mediated by the AUTONOMIC nervous system rather than by the conscious will.

involuntary muscle

or

visceral muscle

or

smooth muscle

a type of muscle called ‘involuntary’ because it is innervated by the AUTONOMIC NERVOUS SYSTEM. It is also called ‘visceral’ as it is found in the alimentary canal, the blood vessels, CILIARY BODY, respiratory passages and URINOGENITAL SYSTEM. It is also called ‘smooth’ since the MYOFIBRILS lack striations. Involuntary muscle contracts slowly and takes a long time to fatigue. Compare STRIATED MUSCLE.
References in periodicals archive ?
Caption: VIDEO Involuntary muscle spasms occurred whenever this patient threw a baseball
CASE 3: A 42 year old female patient had involuntary muscle contractions on left side of face from 36 months.
ECDs take advantage of electro-muscular disruption technology, which uses a high-voltage, low-power charge of electricity to disrupt the central nervous system and induce involuntary muscle contractions.
(b) involuntary muscle contraction accompanied by severe pain, which can occur in the legs, arms, hands or abdomen
After several years of taking the drugs, both women say they developed tardive dyskinesia, a long-term neurological disorder that causes involuntary muscle movements.
Depending on the signal strength, many involuntary selections can occur because of noise or involuntary muscle activations when high-sensitivity levels are used [19-20].
In her short life span so far Millie has not moved apart from a few involuntary muscle spasms, which is very distressing to witness.
Takeshige suggests that electromagnetic resonance may also cause a decrease in serotonin in the pineal and brainstem raphe nucleus, which controls involuntary muscle tone.
Taken as a mouth spray, it is used to help alleviate symptoms of spasticity - involuntary muscle stiffness and spasms - associated with MS and is said to be the first symptom relief drug specifically for those with the condition.
The power plate induces involuntary muscle contractions within the targeted areas of the body to help improve muscle strength and tone.
John Benson QC, prosecuting, said Stevens, an environmental officer, was suffering from a medical condition called dystonia, an involuntary muscle spasm.
This makes using the system easier for those with involuntary muscle movements or who have difficulty remaining still for long periods of time.

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