| nasal decongestants | Drugs that shrink the swollen membranes in the nose and make it easier to breath. Decongestants can be taken orally or by nasal spray. Decongestant nasal spray should not be used for more than five days without the doctor s advice, and if so, usually only when accompanied by a nasal steroid. Decongestant nasal sprays often cause a rebound effect if taken too long. A rebound effect is the worsening of symptoms when a drug is discontinued. This is a result of a tissue dependence on the medication. (12 Dec 1998) |
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| nasal duct | The passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity. Synonym: ductus nasolacrimalis, nasal duct. (05 Mar 2000) |
| nasal feeding | The giving of nourishment through a flexible tube passed through the nasal passages into the stomach. (05 Mar 2000) |
| nasal foramen | Vascular foramen opening on the outer surface of each nasal bone. (05 Mar 2000) |
| nasal ganglion | A small parasympathetic ganglion in the upper part of the pterygopalatine fossa whose postsynaptic fibres supply the lacrimal, nasal, palatine and pharyngeal glands. Synonym: ganglion pterygopalatinum, Meckel's ganglion, nasal ganglion, sphenopalatine ganglion. (05 Mar 2000) |
| nasal glands | Seromucous glands in the respiratory region of the nasal mucous membrane. Synonym: glandulae nasales. (05 Mar 2000) |
| nasal glioma | <tumour> Term for a lesion that is probably not a true neoplasm, but an unusual anomaly consisting of glial tissue with reactive astrocytes, ganglionic neurons, and ependymal cells in small nodules at the base of the nose. (05 Mar 2000) |
| nasal haemorrhage | <clinical sign> Nosebleed, haemorrhage from the nose. (18 Nov 1997) |
| nasal index | Relation of the greatest width of the nasal aperture to the length of a line from the nasion to the lower border of the nasal aperture: (nasal width × 100)/nasal height. (05 Mar 2000) |
| nasal lavage fluid | Fluid obtained by irrigation or washout of the nasal cavity and nasal mucosa. The resulting fluid is used in cytologic and immunologic assays of the nasal mucosa such as with the nasal provocation test in the diagnosis of nasal hypersensitivity. (12 Dec 1998) |
| nasal margin of frontal bone | The border of the frontal bone that articulates with the nasal bones. Synonym: margo nasalis ossis frontalis, nasal margin of frontal bone. (05 Mar 2000) |
| nasal meatus | Any of three passages in the nasal cavity formed by the projection of the conchae: middle nasal meatus, lies below the inferior concha; middle nasal meatus, lies between the middle and inferior conchae; superior nasal meatus, lies between the superior and middle conchae. Synonym: meatus nasi. (05 Mar 2000) |
| nasal mucosa | The mucous membrane lining the nasal cavity. (12 Dec 1998) |
| nasal muscle | <anatomy> Compound muscle consisting of: a transverse part (pars transversa musculi nasalis, musculus compressor naris) arising from the maxilla above the root of the canine tooth on each side and forming an aponeurosis across the bridge of the nose; and an alar part (pars alaris musculi nasalis, musculus dilator naris) arising from the maxilla above the lateral incisor and attaching to the wing of the nose; the alar part dilates the nostril; nerve supply, facial. Synonym: musculus nasalis, nasal muscle. (05 Mar 2000) |
| nasal myiasis | Fly larva invasion of the nasal passages, due most commonly in the U.S. To primary screw-worms, the larvae of Cochliomyia hominivorax, which develop in the nasal or aural cavity. (05 Mar 2000) |