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Atrophy : Definition, Myogenic Causes, and Neurogenic Causes

Saturday, September 22nd 2012. | General

Atrophy Definition

Muscular corresponds to a decrease in the volume of striated muscle.

The atrophy is due to a reduction in the number of muscle fibers within the muscle or in connection with a lesion of these fibers (myogenic muscular) or with nerve damage (neurogenic atrophy).

It can also occur in the aftermath of prolonged immobilization whether the result of an accident or illness or whatever the elderly who reduce their activity.

The atrophy is characterized by a loss of muscle relief and this subjective impression can be confirmed by additional tests:  ultrasound or muscle electromyogram (EMG).

Atrophy

Myogenic Causes

The atrophy of the muscles of the root of the members is one of the main signs of the existence of myopathy (muscle damage from a genetic disease).

The muscles lose their strength and volume.

To determine the type of myopathy involved, genetic testing and biopsy (sample) of a muscle are often necessary.

Prognosis and treatment depend on the disease diagnosed.

Neurogenic Causes

Neurogenic muscular atrophy is most often related to a motor nerve that controls the muscle injury that may sit directly on the nerve (trauma, stretching …) or spinal cord (amyotrophic lateral sclerosis, acute poliomyelitis .. .).

These are the muscles most devices that are most commonly affected, this joins in cramps, muscle spasms, and sometimes decreased reflexes.

The diagnosis is made by a neurologist who can help further tests such as EMG or MRI of the spinal cord.

Finally, in very exceptional cases, neurogenic muscle atrophy may be related to a disease of the central nervous system (tumor, stroke).

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