Video 1 - Videofluoroscopy of deglutition and primary peristalsis.
From the following article
William G. Paterson
GI Motility online (2006)
doi:10.1038/gimo13
The subject swallows a mouthful of barium sulfate, which is then propelled down the esophagus and into the stomach by a peristaltic contraction wave.
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