pharyngoesophageal constriction, the narrowing where the pharynx ends and the cervical esophagus begins, the site of the pharyngoesophageal sphincter.
pharyngoesophageal constriction
pharyngoesophageal constriction, the narrowing where the pharynx ends and the cervical esophagus begins, the site of the pharyngoesophageal sphincter.