Paranasal sinuses are air-filled spaces in the bones of the walls of the nasal cavity
The paranasal sinuses are extensions of the respiratory segment of the nasal cavity and are lined by respiratory epithelium. The sinuses are named for the bone in which they are found, i.e., the ethmoid, frontal, sphenoid, and maxillary bones. The sinuses communicate with the nasal cavities via narrow openings onto the respiratory mucosa. The mucosal surface of the sinuses is a thin, ciliated, pseudo-stratified columnar epithelium with numerous goblet cells. Mucus produced in the sinuses is swept into the nasal cavities by coordinated ciliary movements. The sinuses are often subject to acute infection following viral infection of the upper respiratory tract. Severe infections may require physical drainage.
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