Assertion: esophagus's sphincter | /r/HasProperty | a band of muscle
Facets:
Source sentences:
text: The orifice is surrounded by a sphincter, a band of muscle, called the pyloric sphincter.
text: Right before the first segment of the esophagus there is the upper esophageal sphincter, a group of muscles that controls breathing, eating, vomiting, and belching.