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Define Nostril

Nostril: It is present within the nose and above the mouth it is regionated anteroposteriorly into the vestibule, respiratory channel and olfactory organs. The cartilaginous nasal septum splits the vestibule into two lateral half. The respiratory channel passes via scroll-like turbinal bones and passes by olfactory area into pharynx via a pair of posterior nare. It executes filtration, air-conditioning and warming.   

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