The nasal meatus refers to the three narrow passageways located within the nasal cavity of the human body. These meatuses, known as the superior, middle, and inferior nasal meatuses, are lined with nasal mucosa and play a crucial role in the respiratory function. They help to warm, humidify, and filter the air as it passes through the nasal cavity before reaching the lungs. The nasal meatuses also assist in directing the airflow and facilitating the sense of smell by allowing the olfactory receptors to come into contact with odor molecules.

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