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motoneuron (mo″to-noor´on) an efferent neuron that conveys motor impulses from the center to cause body parts to move. Called also motor neuron

Motoneuron shown as the efferent neuron in a three-neuron reflex arc.

lower motoneuron a peripheral neuron whose cell body lies in the ventral gray columns of the spinal cord and whose termination is in a skeletal muscle.

peripheral motoneuron a neuron in a peripheral reflex arc that receive impulses from interneurons and transmits them to voluntary muscles.

upper motoneuron a neuron in the cerebral cortex that conducts impulses from the motor cortex to a motor nucleus of one of the cerebral nerves or to a ventral gray column of the spinal cord.

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