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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.
Where do cells of the corticospinal tract originate? 60% originate from areas 4&6 of the frontal lobe and project to ventral motor horn. 40% originate from areas 3a,3b,1,2,5,7 of parietal lobe and project to dorsal horn to modulate sensory input.