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Pressure changes during the second cycle in axial sections 7, 11, 15, and 19 at 4 cm apart and progressively lower in the spinal canal. Section 7 is approximately 1 cm above the craniovertebral junction. The cyclic pressure changes are minimal near the craniovertebral junction (section 7) and are progressively greater with distance along the spinal canal (sections 11–19).
