Which phase follows the oral preparatory phase in the sequence of swallowing?

• A. Pharyngeal phase
• B. Esophageal phase
• C. Oral preparatory phase
• D. None of the above

Answer: (A)

After the mouth has prepared and formed the bolus during the oral preparatory phase, the next stage is the pharyngeal phase. This phase is reflexive and rapidly drives the bolus from the oropharynx into the esophagus while protecting the airway. The larynx rises and the epiglottis tilts to cover the airway, the vocal folds come together, and the pharyngeal constrictors squeeze the bolus downward. The upper esophageal sphincter relaxes to allow entry into the esophagus, where the esophageal phase then takes over with peristaltic movement. So, the sequence moves from preparation to pharyngeal propulsion, then to the esophageal stage.