The pharynx is a muscular tube located behind the nasal cavity and mouth, connecting to the esophagus. Its primary role in digestion is to propel swallowed food (bolus) from the oral cavity into the esophagus through coordinated muscular contractions. This process is part of deglutition (swallowing), which involves voluntary initiation in the mouth followed by involuntary reflexes in the pharynx. The pharyngeal muscles contract in sequence, pushing the bolus downward while preventing entry into the respiratory tract.