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lower esophageal sphincter

   Also found in: Medical, Acronyms, Encyclopedia, Wikipedia 0.03 sec.
lower esophageal sphincter
n.
A ring of smooth muscle fibers at the junction of the esophagus and stomach. Also called cardiac sphincter, gastroesophageal sphincter.


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A transnasal esophageal pH catheter with a sensor placed 5 cm above the lower esophageal sphincter recorded reflux events and the acid clearance time for each event, while polysomnography recorded reflux-associated arousals and awakenings.
When the lower esophageal sphincter (LES) that separates the esophagus and the stomach fails to close properly, the stomach contents--a mix of food, enzymes, bile, and acid--backwash into the esophagus, often producing the sour taste and discomfort or outright pain of heartburn.
However there are times when the Lower Esophageal Sphincter does not operate properly, then acid from the stomach reflux into the esophagus.
 
 
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