Nostril

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Human nostrils
Human nostrils
A horse's snout. Note the prominent nostrils.
A horse's snout. Note the prominent nostrils.

A nostril (or naris, pl. nares) is one of the two channels of the nose, from the point where they bifurcate to the external opening. In birds and mammals, they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture on exhalation. Fish do not breathe through their noses, but they do have two small holes used for smelling which may be called nostrils.

The Procellariiformes are distinguished from other birds by having tubular extensions of their nostrils.

In humans, the nasal cycle is the normal ultradian cycle of each nostril's blood vessels becoming engorged in swelling, then shrinking. During the course of a day, they will switch over approximately every four hours or so, meaning that only one nostril is used at any one time.[1]

  1. ^ Nasal Obstruction

v • d • e
General anatomy of head and neck - head
Face/Occiput Forehead • Eye • Ear • Temple • Cheek • Chin
External nose Nostril • Nasal septum • Cartilages (Accessory nasal, of the septum, Greater alar, Lateral nasal, Lesser alar, Vomeronasal)  • Olfactory glands
Nasal cavity Choana • Turbinate • Sphenoethmoidal recess • Ethmoid bulla • Hiatus semilunaris • Ostium maxillare • Inferior meatus • Vomeronasal organ • Paranasal sinus
Mouth/oral cavity Lip (Upper, Lower)  • Philtrum • Jaw • Pterygomandibular raphe
Teeth Permanent (Incisor, Canine, Premolar, Molar)  • Deciduous
Tongue Plica fimbriata • Median sulcus • Foramen cecum • Terminal sulcus • Frenulum linguae • Anterior tongue • Posterior tongue
Palate/roof of mouth Hard palate • Soft palate • Palatine raphe • Incisive papilla • Uvula • Pharyngeal recess • Arches (Palatoglossal, Palatopharyngeal)
Salivary glands Parotid gland/Parotid duct • Submandibular gland/Submandibular duct • Sublingual gland/Major sublingual duct
Other fascia (Masseteric fascia, Temporal fascia, Galea aponeurotica) • Scalp
Retrieved from "http://en.wikipedia.org/wiki/Nostril"
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