Ekberg O, Lindström C
Acta Radiol. 1987 Mar-Apr;28(2):173-6.
The localization of the upper esophageal sphincter is partly controversial. The aim of the present study was to elucidate whether or not the sphincter area could be allocated within an area inferior to and separate from the cricopharyngeal muscle. Cineradiography of the pharyngo-esophageal segment in 252 dysphagial patients disclosed a posterior impression in 55 (22%). There were no signs of a circular impression or other indications of a sphincter localized inferior to the circopharyngeus as revealed on these cinefilms. Macro- and microscopic examination of 16 autopsy specimens revealed the level of the upper esophageal sphincter to be localized within the cricopharyngeal muscle. There was no indication of any sphincter inferior to the cricopharyngeus in the cervical esophagus.
食管上括约肌的定位存在一定争议。本研究的目的是阐明括约肌区域是否能被划定在咽下缩肌下方且与之分离的区域内。对252例吞咽困难患者的咽食管段进行动态放射成像检查发现，55例（22%）存在后壁压迹。这些动态影像未显示出环形压迹或其他表明括约肌位于咽下缩肌下方的迹象。对16份尸检标本进行大体和显微镜检查发现，食管上括约肌位于咽下缩肌内。在颈段食管中没有证据表明在咽下缩肌下方存在任何括约肌。
