From Wikipedia, the free encyclopedia
"Nares" redirects here. For information on the nares of a beak, see Beak.
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]
[edit] References
- ^ Nasal Obstruction
[edit] External links
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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 - 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 - Sublingual - Submandibular) - Ducts: Submandibular - Parotid
Masseteric fascia - Temporal fascia - Galea aponeurotica - Scalp
NECK: Throat – Pharynx - Larynx
Cartilages: Cricoid - Thyroid (Adam's apple) - Epiglottis - Arytenoid - Cuneiform - Corniculate
Extrinsic ligaments: Thyrohyoid membrane (Lateral thyrohyoid ligament, Median thyrohyoid ligament) - Hyoepiglottic ligament - Cricotracheal ligament Intrinsic ligaments: Cricothyroid ligament
Folds: (Glossoepiglottic - Aryepiglottic - Vocal - Vestibular) - Vocal ligament - Ventricle of the larynx - Infraglottic cavity - Vestibule of larynx - Rima glottidis - Glottis
Triangles of the neck: Anterior of the neck (Muscular, Carotid, Submandibular, Submental) - Posterior of the neck (Occipital, Subclavian) - Suboccipital
Deep cervical fascia (Pretrachial fascia, Prevertebral fascia, Investing layer) - Carotid sheath
Retropharyngeal space
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