Assertion: esophagus's sphincter | /r/HasProperty | a bundle of muscles
Facets:
value: at the top of the esophagus
type: LOCATION
Source sentences:
text: The upper esophageal sphincter (UES) is a bundle of muscles at the top of the esophagus.
text: The lower esophageal sphincter (LES) is a bundle of muscles at the low end of the esophagus, where it meets the stomach.