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Unformatted text preview: Overview of the Nasal Cavity & Paranasal Sinuses The nasal cavity is that part of the upper respiratory tract where inhaled air is warmed, humidified and filtered. It is the only site where a cranial nerve (CN I, olfactory) has its peripheral process extending outside of the body (into the nasal mucosa). The walls of the nasal cavity consist of a roof, floor, medial and lateral wall. The roof is formed from the cribriform plate of the ethmoid bone. The floor is formed by the palatine process of the maxillae and the horizontal processes of the palatine bones. The nasal septum forms the medial wall. The lateral wall is formed by the 3 conchae, superior, middle and inferior. Beneath each concha is a meatus (superior, middle and inferior). Above the superior concha is the sphenoethmoidal recess. The nasal cavity has two openings. Anteriorly, the nares open onto the face. Posteriorly, the choanae open into the nasopharynx. The nasal septum is cartilaginous anteriorly, and bony (vomer & perpendicular plate of...
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This note was uploaded on 02/17/2012 for the course MPAS PA 602 taught by Professor Dr.laird during the Fall '10 term at Chatham University.
- Fall '10