myoclonus
Noun A sudden, brief, involuntary twitching or jerking of a muscle or group of muscles. It is a type of movement disorder that can occur in healthy people (e.g., a hypnic jerk when falling asleep) or as a symptom of various neurological conditions.
Myoclonus is a medical term used to describe a specific clinical sign. It is typically used in formal, clinical, or scientific contexts. - It functions as a singular noun (e.g., "The patient exhibits myoclonus."). - It can be modified by adjectives describing its type, cause, or location (e.g., nocturnal myoclonus, cortical myoclonus, facial myoclonus).
- The neurologist diagnosed the repetitive jerks as myoclonus.
- Myoclonus can be a side effect of certain medications.
- He experienced a sudden myoclonus in his arm, causing him to drop the cup.
- The study focused on the pathophysiology of epileptic myoclonus.
- Action myoclonus: Myoclonus that is triggered or worsened by voluntary movement.
- Stimulus-sensitive myoclonus: Myoclonus provoked by external stimuli such as light, sound, or touch.
- Myoclonus-dystonia: A specific neurological syndrome characterized by a combination of myoclonic jerks and dystonic movements or postures.
- Myoclonic (adjective): Relating to or characterized by myoclonus.
- Example: She has a myoclonic disorder.
- Myoclonus is the root term; there are no common verb or adverb forms.
- Muscle jerk
- Muscle twitch (though this can imply a milder, more common phenomenon)
- Clonic spasm (a more technical synonym from the reference definition)
There is no direct antonym for this specific medical sign. Broader conceptual opposites could include: - Muscle atonia (lack of muscle tone) - Paralysis (loss of muscle function)
Myoclonus refers to the symptom itself, not its cause. It is distinct from other movement disorders like tremors (rhythmic oscillations) or tics (semi-voluntary, suppressible movements often preceded by an urge). The reference definition's phrase "clonic spasm" indicates a spasm with a rapid, repetitive pattern of contraction and relaxation.
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a clonic spasm of a muscle or muscle group
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