Abstract
The upper esophageal sphincter is defined as the components of the pharyngoesophageal region which contribute to the opening and closing of the pharyngo-esophageal junction during various physiologic states.
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Lang, I.M., Shaker, R. An update on the physiology of the components of the upper esophageal sphincter. Dysphagia 9, 229–232 (1994). https://doi.org/10.1007/BF00301915
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DOI: https://doi.org/10.1007/BF00301915