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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.
The corticospinal tract is a group of axons that extend from the brain to the spinal cord. It originates at the cortex of the brain, and it ends in the ventral horn of the spinal cord.bout 50 percent of the corticospinal tract fibers originate from the primary motor cortex, particularly in layer V cells called Betz cells. Additional fibers come from the premotor cortex, supplementary motor area, somatosensory cortex, cingulate gyrus and parietal lobe.