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This type of descending motor pathway originates in the brainstem and governs automatic movements that help regulate muscle tone, posture and balance.
Lateral corticospinal tract. Primary motor cortex which occupies the posterior portion of the precentral gyrus. More than half arise from area: 4, remainder arise from premotor and supplementary motor areas: 6, or from parietal lobe areas: 3, 1, 2, 5, and 7. Cortical layer 5 pyramidal cells, Betz cells.