Electromyogram
Electromyogram
Electromyogram (pronunciation: /ɪˌlɛktrəʊˈmaɪəʊɡræm/), often abbreviated as EMG, is a diagnostic procedure used to assess the health of muscles and the nerve cells that control them (motor neurons).
Etymology
The term "Electromyogram" is derived from the Greek words elektro (electricity), myo (muscle), and gramma (something written).
Procedure
An EMG translates these signals into graphs or numbers, helping doctors to diagnose muscle disorders, nerve disorders, and disorders affecting the connection between nerves and muscles.
Types of EMG
There are two kinds of EMG in common use: Surface EMG and Intramuscular EMG. In a typical EMG procedure, a needle electrode is inserted through the skin into the muscle. A trained professional observes the electrical activity while inserting the electrode, but the main recording is from the activity during rest and during voluntary contraction.
Related Terms
- Electrode: A conductor through which electricity enters or leaves an object, substance, or region.
- Motor Neuron: A nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland.
- Nerve Conduction Study: Tests that measure how well and how fast the nerves can send electrical signals.
- Neuromuscular Junction: A synapse between a motor neuron and skeletal muscle.
See Also
External links
- Medical encyclopedia article on Electromyogram
- Wikipedia's article - Electromyogram
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