Upper esophageal sphincter (UES) Posted on July 27, 2010March 8, 2011 by Robert Bastian See [intlink id=”113″ type=”post”]cricopharyngeus muscle[/intlink]. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window) Related Posted in Glossary.