What are motor nerve conduction studies?

Updated: Aug 20, 2018
  • Author: Stephen Kishner, MD, MHA; Chief Editor: Jonathan P Miller, MD  more...
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Answer

In motor nerve conduction studies, motor nerves are stimulated and the compound muscle action potential from the muscle is recorded. This corresponds to the integrity of the motor unit. Results of this study can be affected by any process that damages the anterior horn cell body or axon, Schwann cells, the neuromuscular junction, or the muscle cell itself. [7] Also analyzed are the size, shape, and morphology of the compound muscle action potential to determine the state of myelination, the number of functioning muscle fibers, and the function of the neuromuscular junction. Since the cell body of motor nerves is located in the anterior horn of the spinal cord, the motor nerve conduction is abnormal in both preganglionic and postganglionic injuries.


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