The pharynx connects the nasal and oral cavities to the larynx and esophagus. It serves as a passageway for air and food and acts as a resonating chamber for speech. The pharynx is located posterior to the nasal and oral cavities and is divided regionally into the nasopharynx and oropharynx, respectively (see Fig. 18.2). The auditory (Eustachian) tubes connect the nasopharynx to each middle ear. Diffuse lymphatic tissue and lymphatic nodules are present in the wall of the nasopharynx. The concentration of lymphatic nodules at the junction between the superior and posterior walls of the pharynx is called the pharyngeal tonsil.
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