pharyngeal muscles pharyngeal muscles the pharyngeal muscles are a group of muscles that form the pharynx, which is posterior to the oral cavity, determining the shape of its lumen, and affecting its sound properties as the primary resonating cavity. pharyngeal musclesmuscles of the pharynx and cheekmuscles of the pharynx, viewed from behind, together with the associated vessels and nervesdetailsnervereceives motor innervation by vagus nerve (cn x). stylopharyngeus receives motor innervation by glossopharyngeal (cn ix)identifierslatinmusculi pharyngis, musculus constrictor pharyngis or tunica muscularis pharyngismeshd010609ta98a04.2.06.001ta22176fma67169anatomical terms of muscle the pharyngeal muscles (involuntary skeletal) push food into the esophagus. there are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer. the outer circular layer includes: superior constrictor muscle middle constrictor muscle inferior constrictor muscle during swallowing, these muscles constrict to propel a bolus downwards (an involuntary process). the inner longitudinal layer includes: stylopharyngeus muscle salpingopharyngeus muscle palatopharyngeus muscle during swallowing, these muscles act to shorten and widen the pharynx. they are innervated by the pharyngeal branch of the vagus nerve (cn x) with the exception of the stylopharyngeus muscle which is innervated by the glossopharyngeal nerve (cn ix).