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The corticospinal tract (all those descending fibers that pass through the pyramids of the medulla) originate in a broad area lying in front of and behind the central sulcus. That part of the tract which starts out in the parietal lobe (blue) appears to be concerned with modulating sensory input rather than initiating movement and it will not be considered in detail in this module. The precentral component of the tract - the part responsible for motor function - is organized in a somatotopic manner at most levels.