Muscle fibrillation
Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole as ascertained by electromyography (EMG). If a motor neuron or its axon is destroyed, the muscle fibers it innervates undergo denervation atrophy. This leads to hypersensitivity of individual muscle fibers to acetyl choline so that they may contract spontaneously. Isolated activity of individual muscle fibers is generally so fine it cannot be seen through the intact skin, although it can be recorded as a short-duration spike in the EMG.
What is Muscle fibrillation?
Muscle fibrillation is a symptom that people may experience for many reasons. It can be related to infections, chronic conditions, injuries, medication effects, or other health changes. The presence of this symptom alone does not diagnose any condition.
If you have Muscle fibrillation that is severe, persistent, or accompanied by other warning signs, contact a qualified healthcare provider.
Possible conditions associated with Muscle fibrillation
The following conditions have been associated with Muscle fibrillation. Only a health professional can determine the underlying cause.
Autosomal dominant centronuclear myopathy
Autosomal dominant centronuclear myopathy is a medical condition that may be associated with various symptoms and signs.
Centronuclear myopathy 1
Centronuclear myopathy 1 is a medical condition that may be associated with various symptoms and signs.
Hereditary motor and sensory neuropathy, Okinawa type
Hereditary motor and sensory neuropathy, Okinawa type is a medical condition that may be associated with various symptom...
Japanese encephalitis
Japanese encephalitis is a medical condition that may be associated with various symptoms and signs.
intellectual developmental disorder with polymicrogyria and seizures
intellectual developmental disorder with polymicrogyria and seizures is a medical condition that may be associated with ...
nemaline myopathy 7
Any nemaline myopathy in which the cause of the disease is a mutation in the CFL2 gene.
polyglucosan body myopathy type 2
Any polyglucosan body myopathy in which the cause of the disease is a mutation in the GYG1 gene.
sensory ataxic neuropathy, dysarthria, and ophthalmoparesis
A rare mitochondrial disease characterized by adult onset of the triad of sensory ataxic neuropathy, dysarthria, and oph...
Related symptoms
When to seek medical care
Seek urgent care if Muscle fibrillation is severe, sudden, or occurs with chest pain, difficulty breathing, confusion, severe weakness, or other serious symptoms.