ELECTRODIAGNOSIS

changes in electricla reactions
When there is disease orinjury of motor nerves or muscles, alterations are liable to occur in thier response to electrical stimulation. the altered electrical reactions may be of considerable assistance in diagnoing the type and extent of the lesion.
Reduction or loss of voluntary power of a muscle may be due to:

1. a lesion of the upper motor neurone.
2. a lesion of the upper motor neurone.
3. damage to the muscle itself.
4. A fault at the neuromuscular junction
5. A functional disorder.

the parts of the motor pathway which are normally accessible for electrical stimulation are the lower motor neurone below its exits from the vertebral canal and the muscle itself, but not the anterior horn cell or the upper motor neurone