The pharyngeal constrictor muscles are a group of three muscles located in the throat, responsible for the process of swallowing. They include the superior, middle, and inferior constrictors, which work together to push food down the esophagus. These muscles contract sequentially, helping to move the food bolus from the mouth through the pharynx. These muscles are innervated by the vagus nerve, which plays a crucial role in coordinating the swallowing reflex. Proper functioning of the pharyngeal constrictors is essential for effective swallowing and preventing aspiration, where food or liquid enters the airway instead of the esophagus.