A motor neuron (or motoneuron) is a nerve cell (neuron) whose cell body is located in the spinal cord and whose fiber (axon) projects outside the spinal cord to directly or indirectly control muscles.
Motor neurons are efferent nerves (also called effector neurons), that carry signals from the spinal cord to the muscles to produce (effect) movement.
Types of motor neurons are alpha motor neurons, beta motor neurons and gamma motor neurons.
see Lower motor neuron.
see Upper motor neuron.
see Motor neuron disease.
In a typical F wave study, a strong electrical stimulus (supramaximal stimulation) is applied to the skin surface above the distal portion of a nerve so that the impulse travels both distally (towards the muscle fiber) and proximally (back to the motor neurons of the spinal cord). (These directions are also known as orthodromic and antidromic, respectively.)