The nasopharynx is the upper part of the throat located behind the nose. It connects the nasal cavity to the oropharynx, which is the middle part of the throat. The nasopharynx plays a crucial role in breathing and helps to equalize pressure in the ears through the Eustachian tubes. This area is also involved in the immune response, as it contains adenoids, which help trap pathogens. The nasopharynx is lined with mucous membranes that help filter and humidify the air we breathe. It is an important passageway for both air and food, although food primarily passes through the oropharynx.