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Spinal Motor Control

Motor neurons in the spinal cord brainstem motor nuclei (motoneurons) are the final effectors of central motor control and provide the output to skeletal muscles, forming motor units. The activity of spinal motoneurons is controlled by descending cortical and brainstem inputs largely via premotor circuits involving excitatory or inhibitory interneurons. These circuits elicit specific patterns of motoneuron activation controlling muscle synergies under the influence of descending corticospinal and brainstem motor pathways. Central pattern generators are interneuron circuits that can autonomously generate activation of motoneurons in the absence of descending commands or afferent feedback and include those involved in locomotion, respiration, and swallowing. Disorders affecting motor neurons or their control by afferent, cortical, or cerebellar influences constitute a large proportion of neurological diseases.