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Related Experiment Videos

The upper esophageal sphincter area.

O Ekberg, C Lindström

    Acta Radiologica (Stockholm, Sweden : 1987)
    |March 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated the upper esophageal sphincter

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    Area of Science:

    • Gastroenterology and Otolaryngology
    • Anatomy and Physiology

    Background:

    • The precise anatomical location of the upper esophageal sphincter (UES) remains a subject of debate.
    • Previous research has proposed varying locations for the UES, leading to ongoing discussion.

    Purpose of the Study:

    • To determine if the upper esophageal sphincter is located inferior to and separate from the cricopharyngeal muscle.
    • To clarify the anatomical boundaries of the UES.

    Main Methods:

    • Cineradiography of the pharyngo-esophageal segment in 252 patients with dysphagia.
    • Macro- and microscopic examination of 16 autopsy specimens.

    Main Results:

    • Cineradiography revealed a posterior impression in 22% of patients but no evidence of a sphincter inferior to the cricopharyngeus.

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  • Autopsy examinations confirmed the upper esophageal sphincter is located within the cricopharyngeal muscle.
  • No sphincter structure was identified inferior to the cricopharyngeus in the cervical esophagus.

    • Conclusions:

    • The upper esophageal sphincter is anatomically located within the cricopharyngeal muscle.
    • Evidence does not support the existence of a distinct sphincter inferior to the cricopharyngeus in the cervical esophagus.