The upper esophageal sphincter (UES) closure muscles include the cervical esophagus, cricopharyngeus, and inferior pharyngeal constrictor, but primarily the cricopharyngeus. The main functions of ...

a: The constrictor and lateral suspensory muscles of the pharynx viewed from the posterior aspect, showing: the pharyngeal raphe, and the superior, middle and inferior pharyngeal constrictor ...