What muscle is responsible for lateral pharyngeal wall movement?

In an attempt to discover what muscle is responsible for medial movement of the lateral pharyngeal wall, the levator muscle was anesthetized with lidocaine under visual control by fiberscope in 3 normal subjects. The results indicate that the medial movement of the lateral pharyngeal wall results from the contraction of the levator. The attendant roll-up of the uvula toward the nasal side induced by the anesthesia was regarded as the action of the uvular muscle without the counterbalance of levator action.