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upper esophageal sphincter

superior portion of the esophagus

en-US/ˈʌpɚ ɪˌsɑfəˈd͡ʒiəl ˈsfɪŋktɚ/
en-GB/ˈʌpə iːsɒfəd͡ʒiːəl sˈfɪŋktə/

Categories:

pharyngeal muscles