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Background
A motor unit (MU) consists of all muscle fibers innervated by one motor neuron. When the neuron discharges all muscle fibers respond by producing action potential (AP) and contraction. The summated electrical activity of all muscle fibers in a MU is called the motor unit potential (MUP). In diagnostic studies, MUPs are recorded using intramuscular needle electrodes. However, MUPs can also be recorded using surface electrodes and are called surface MUPs (SMUPs). The SMUPs are the building block of the compound muscle action potential (CMAP) as well as the F waves recorded in motor nerve conduction study.
