motor neurone n. one of the units (neurones) that goes to make up the nerve pathway between the brain and an effector organ, such as a skeletal muscle. lower m. n. a motor neurone that has a cell body in the spinal cord or brainstem and an axon that extends outwards to reach an effector. upper m. n. a motor neurone that has a cell body in the brain and an axon that extends into the spinal cord, where it ends in synapses.
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