Olfactory and respiratory epithelium cover different portions of the nasal cavity for distinct functions.
Olfactory epithelium lines the roof of the nasal cavity in the caudal portions and is responsible for facilitating the sense of smell. It is a specialized tall, pseudostratified epithelium containing olfactory receptor cells, sustentacular cells, and basal cells.
Respiratory epithelium primarily covers the majority of the nasal cavity and is composed of pseudostratified ciliated columnar epithelium with goblet cells. This type of epithelium functions to warm, humidify incoming air, and helps in trapping debris.
The nasal vestibule located in the most rostral segment of the nasal cavity is lined with keratinized stratified squamous epithelium, which transitions into respiratory epithelium that lines the rest of the nasal cavity.
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