The medullary pyramids are paired white matter structures of the brainstem's medulla oblongata that contain motor fibers of the corticospinal and corticobulbar tracts – known together as the pyramidal tracts. The lower limit of the pyramids is marked when the fibers cross (decussate).
Anterior in the medulla are the paired medullary pyramids, which carry corticospinal tracts to their decussation at the medullary-spinal junction, then continue as the lateral corticospinal tracts in the spinal cord.
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