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The cross-sectional muscle shape for each of the 3 manometrically determined zones in the UES. Zone I (esophago-UES), predominantly oval-shaped; zone II (UES), predominantly C-shaped; and zone III (UES-pharyngeal), predominantly flat-shaped. The distance (cm) from the nares to the tip of the manometry catheter is shown at the top of the representative tracing. UES, upper esophageal sphincter.
