fasciculation
Noun: 1. A small, spontaneous, involuntary, and localized twitching or contraction of a group of muscle fibers (a fascicle) that is visible under the skin. It appears as a brief, fine, rippling movement and is often described as a "muscle flicker." Fasciculations are common and typically benign, but they can also be associated with certain neurological conditions.
Fasciculation is a medical and physiological term used to describe a specific type of muscle activity. It is typically used in clinical, diagnostic, and anatomical contexts. * It is most commonly used as a countable noun (e.g., a fasciculation, several fasciculations). * It can also be used in an uncountable sense to refer to the phenomenon in general.
- Benign fasciculation syndrome is characterized by persistent muscle twitches without any underlying neurological disease.
- The neurologist observed fasciculations in the patient's calf muscle during the examination.
- Fatigue and stress can sometimes trigger muscle fasciculation.
- While usually harmless, widespread fasciculations can be a symptom requiring further investigation.
- Clinical Description: In a neurological exam, a doctor might note: "Fasciculations were noted in the tongue and bilateral quadriceps," which is a significant finding.
- Electromyography (EMG): In this diagnostic test, fasciculations appear as spontaneous, irregular discharges of motor unit action potentials.
- Fasciculate (adjective): Arranged in or forming a bundle or cluster. (Primarily a botanical term, e.g., ).
- Fascicle (noun): A small bundle or cluster, especially of nerve or muscle fibers.
- Fasciculus (noun): Another term for a bundle of anatomical fibers, such as nerve or muscle fibers.
- Muscle twitch: A more general, common term for a similar phenomenon, though not always medically precise.
- Myokymia: A related condition involving continuous, fine, wave-like quivering of a muscle, often used specifically for eyelid twitches.
- Paralysis: The complete loss of muscle function and voluntary movement.
- Flaccidity: The state of being soft, limp, and lacking normal muscle tone.
The primary and most current meaning of fasciculation in modern English (especially in medicine and biology) is the involuntary muscle twitch. The reference to botany ("the arrangement in a bundle") is an older or more specialized usage for the related adjective fasciculate. The core noun form in contemporary contexts almost exclusively refers to the muscular event.
- muscular twitching of contiguous groups of muscle fibers
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