| INA | infectious nucleic acid; inferior nasal artery; International Neurological Association |
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| INQ | interior nasal quadrant |
| INV | inferior nasal vein |
| NAR | nasal airway resistance; National Association for Retarded [Children, Citizens]; no action required |
| NAS | nasal; National Academy of Sciences; National Association of Sanitarians; neonatal airleak syndrome;... |
| nasal pits | The paired depressions formed when the nasal placodes come to lie below the general external contour of the developing face as a result of the rapid growth of the adjacent nasal elevations; the pit's are the primordia of the rostral portions of the nasal chambers. Synonym: olfactory pits. (05 Mar 2000) |
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| nasal placodes | Paired ectodermal placode's which come to lie in the bottom of the olfactory pits as the pits are deepened by the growth of the surrounding medial and lateral nasal processes. Synonym: nasal placodes. (05 Mar 2000) |
| nasal point | <anatomy> The middle point of the nasofrontal suture. Origin: Nl, fr. L. Nasus nose. Source: Websters Dictionary (01 Mar 1998) |
| nasal polyp | <otolaryngology> A projection of the mucosa lining the nasal and paranasal sinuses that is rounded and elongated within the nasal cavity. A common cause for nasal airway obstruction in patients who suffer from allergic sinusitis. They are found more commonly in those with chronic allergic rhinitis or sinusitis. Large nasal polyps can interfere with nasal breathing and are often removed surgically to improve breathing and decrease chronic allergic symptoms. (27 Sep 1997) |
| nasal polyps | Focal accumulations of oedema fluid in the nasal mucosa accompanied by hyperplasia of the associated submucosal connective tissue. Polyps may be neoplasms, foci of inflammation, degenerative lesions, or malformations. (12 Dec 1998) |
| nasal process | The upward extension from the body of the maxilla, which articulates with the frontal bone. Synonym: nasal process, processus frontalis maxillae. (05 Mar 2000) |
| nasal provocation tests | Application of allergens to the nasal mucosa. Interpretation includes observation of nasal symptoms, rhinoscopy, and rhinomanometry. Nasal provocaton tests are used in the diagnosis of nasal hypersensitivity, including hay fever. (12 Dec 1998) |
| nasal reflex | Sneezing caused by irritation of the nasal mucous membrane. (05 Mar 2000) |
| nasal region | The region of the nose. Synonym: regio nasalis. (05 Mar 2000) |
| nasal ridge | An elevation on the lateral wall of the nasal cavity lying between the atrium of the middle meatus and the olfactory sulcus; it is formed by the mucous membrane covering the base of the ethmoidal crest of the maxilla. Synonym: nasal ridge. (05 Mar 2000) |
| nasal sacs | The deepened nasal pits that develop into the definitive nasal cavities. (05 Mar 2000) |
| nasal septal cartilage | A thin cartilaginous plate located between vomer, perpendicular plate of the ethmoid, and nasal bones, and completing the nasal septum anteriorly. Synonym: cartilago septi nasi, cartilage of nasal septum, cartilaginous septum, pars cartilaginea septi nasi, quadrangular cartilage, septal cartilage. (05 Mar 2000) |
| nasal septum | The dividing wall that runs down the middle of the nose so that there are normally two sides to the nose, each ending in a nostril. (12 Dec 1998) |
| nasal spine of frontal bone | A projection from the centre of the nasal part of the frontal bone, which lies between and articulates with the nasal bones and the perpendicular plate of the ethmoid. Synonym: spina nasalis ossis frontalis. (05 Mar 2000) |
| nasal surface of maxilla | The surface of the maxilla that forms part of the lateral nasal wall with a large defect (maxillary hiatus) posteriorly and the lacrimal sulcus in its midportion. Synonym: facies nasalis maxillae. (05 Mar 2000) |