Swallowing Disorders: Introduction - Hopkins Medicine

This muscle serves to prevent the esophagus from filling with air during inspiration. At the lower end of the esophagus, the lower esophageal sphincter (LES) separates the esophagus from the stomach. The LES prevents reflux of irritating gastric contents into the esophagus. The mouth prepares the bolus for swallowing. The lips prevent drooling. ................
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