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The vestibule of the nose is the forward section of the nasal cavity, located just inside each nostril. This area is lined with skin that contains coarse hairs called vibrissae, which help filter inhaled air. The vestibule serves as the initial entry point for air into the respiratory tract. It is part of the upper airway system, which also includes the sinuses and pharynx. The nasal cavity itself is complex, featuring bony ridges called nasal conchae that increase surface area for warming and humidifying air before it reaches the lungs.123

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