The contraction of the muscle constricts the middle portion of the pharynx. Similarly to the superior and inferior pharyngeal constrictor muscles, it is innervated by a branch of the vagus nerve through the pharyngeal plexus. The muscle inserts (posteriorly) into the pharyngeal raphe, blending with its contralateral partner at the midline. The chondropharyngeal part represents the muscle's anterior origin. Chondropharyngeal part - arises from the lesser cornu of the hyoid bone, and (the inferior portion of) the stylohyoid ligament.Ceratopharyngeal part - arises (the entire superior margin of) the greater cornu of the hyoid bone.Two parts of the middle pharyngeal constrictor muscle are distinguished according to its sites of origin: The muscle's fibers diverge from their origin: the more inferior fibres descend deep to the inferior pharyngeal constrictor muscle the middle portion of fibres pass transversely the more superior fibers ascend and overlap the superior pharyngeal constrictor muscle. The middle pharyngeal constrictor is a sheet-like, fan-shaped muscle. It acts to propel a bolus downwards along the pharynx towards the esophagus, facilitating swallowing. It is innervated by a branch of the vagus nerve through the pharyngeal plexus. The middle pharyngeal constrictor originates from the greater cornu and lesser cornu of the hyoid bone, and the stylohyoid ligament. It is smaller than the inferior pharyngeal constrictor muscle. It is one of three pharyngeal constrictor muscles. The middle pharyngeal constrictor is a fan-shaped muscle located in the neck.
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