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Paranasal sinuses - Paranasal sinuses air spaces...

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Paranasal sinuses : air spaces surrounding nasal cavity located in frontal, sphenoid, ethmoid & maxillary bones - help to warm & moisten air - mucus secreted ordinarily flows into nasal cavity - sinusitis : inflamed sinuses; can be caused by spread of infection from nasal mucosae Pharynx (throat): connects nasal cavity & mouth superiorly with larynx & esophagus inferiorly - nasopharynx : posterior to nasal cavity; continuous with nasal cavity through internal nares o air passageway o mucosa of pseudostratified ciliated columnar epithelium o uvula : extension of soft palate that closes off nasopharynx from rest of pharynx during swallowing o pharyngeal tonsil (adenoids): located on superior aspect of posterior wall of nasopharynx; lymphatic tissue that destroys pathogens entering nasopharynx o auditory (pharyngotympanic) tubes : open into lateral walls of nasopharynx; drain middle ear cavities tubal tonsils : located over auditory tube openings; protect against middle ear infections - oropharynx
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