Clinic Preparation Dysphagia: swallowing disorder Swallowing: Oral cavity Pharynx Esophagus Salivary glands Oral cavity: Teeth, palates, tongue, cheek, anterior faucial pillars Pharynx: Nasopharynx Oropharynx Laryngopharynx Musculotendinous tube: External circular layer: superior pharyngeal constrictor, middle pharyngeal constrictor, inferior pharyngeal constrictor Internal circular layer: stylopharyngeus muscle, salpingopharyngeus muscle.