Experimental Study on Function of the Upper Esophageal Sphincter After Radical Operation for Esophageal Cancer
The upper esophageal sphincter (UES), located between the esophagus and the pharynx, provides a barrier against esophagopharyngeal reflux and subsequent aspiration of intraesophageal contents such as food or digestive juices. This consists of the cricopharyngeus muscle and the upper part of esophageal circular muscle. The UES is presented as a high pressure zone manometrically, with the pressure (UESP) higher than pharyngeal or esophageal pressure, i.e., around 39mmHg as reported by Tokuhara et al. , and the length of this high pressure zone is about 2–4 cm.
KeywordsEsophageal Cancer Recurrent Laryngeal Nerve Cervical Esophagus Esophageal Pressure High Pressure Zone
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