MeSH definition : The structure at the pharyngoesophageal junction consisting chiefly of the CRICOPHARYNGEUS
MUSCLE. It normally occludes the lumen of the ESOPHAGUS, except during SWALLOWING.;
MeSH annotation : diseases: coordinate IM with ESOPHAGEAL DISEASES (IM) or specific esophageal disease
(IM); neoplasms: coordinate IM with ESOPHAGEAL NEOPLASMS (IM);
Wikipedia link : https://en.wikipedia.org/wiki/Esophageal sphincter, upper;
The structure at the pharyngoesophageal junction consisting chiefly of the CRICOPHARYNGEUS
MUSCLE. It normally occludes the lumen of the ESOPHAGUS, except during SWALLOWING.