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  • nasal cavity
    the cavity on either side of the nasal septum, lined with ciliated respiratory mucosa, extending from the naris anteriorly to the choana posteriorly, and communicating with the paranasal sinuses through their orifices in the lateral wall, from which also project the three conchae; the cribriform plate, through which the olfactory nerves are transmitted, forms the roof; the floor is formed by the hard palate.

    Alternate names: cavitas nasiTA, cavum nasi

    See Also: bony nasal cavity

  • nasal crest
    the midline ridge in the floor of the nasal cavity, formed by the union of the paired maxillae and palatine bones; the vomer attaches to the crest.

    Alternate names: crista nasalisTA, semicrista incisiva

  • nasal crest of horizontal plate of palatine bone
    superiorly (nasally) directed bony crest, formed at the meeting of the horizontal processes of the right and left palatine bones, for attachment of the nasal septum.

    Alternate names: crista nasalis laminae horizontalis ossis palatiniTA

  • nasal crest of palatine process of maxilla
    superiorly (nasally) directed bony crest, formed at the meeting of the palatine processes of the right and left maxillae, for attachment of the nasal septum.

    Alternate names: crista nasalis processus palatini maxillaeTA

  • Nasal decongestants

    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.

  • nasal feeding
    the giving of nourishment through a flexible tube passed through the nasal passages into the stomach.
  • nasal fin
    A platelike fin between the lateral and medial nasal prominences that disappears as the nose forms.
  • nasal foramina
    vascular foramen opening on the outer surface of each nasal bone.

    Alternate names: foramina nasaliaTA

  • nasal glands
  • nasal glioma
    term for a lesion that is probably not a true neoplasm, but a teratoma consisting of glial tissue with reactive astrocytes, ganglionic neurons, and ependymal cells in small nodules at the dorsum of the nose, often with intracranial connections.
  • nasal height
    the distance between the nasion and the lower border of the nasal aperture.
  • 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.
  • nasal margin of frontal bone
    the border of the frontal bone that articulates with the nasal bones.

    Alternate names: margo nasalis ossis frontalisTA, nasal border of frontal bone

  • nasal meatus
    any of four passages in the nasal cavity formed by the projection of the conchae: inferior nasal meatus [TA] (meatus nasi inferior [TA]), lies below the inferior concha; middle nasal meatus [TA] (meatus nasi medius [TA]), lies between the middle and inferior conchae; superior nasal meatus [TA] (meatus nasi superior [TA]), lies between the superior and middle conchae; common nasal meatus [TA] (meatus nasi communis [TA]) is the part of the nasal cavity between the conchae and the nasal septum.

    Alternate names: meatus nasiTA

  • 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.
  • nasal notch
    the notch in the medial border of the maxilla anteriorly that, with its fellow, forms most of the piriform opening of the nasal cavity.

    Alternate names: incisura nasalisTA

  • nasal part of frontal bone
    nasal portion of the frontal bone that lies between the two orbital parts anteriorly and forms part of the roof of the nasal cavity.

    Alternate names: pars nasalis ossis frontalisTA

  • nasal pits
  • nasal placodes
    paired ectodermal placodes that 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.

    Alternate names: olfactory placodes

  • nasal polyp
    an inflammatory or allergic polyp, arising from the ostium or cavity of one of the paranasal sinuses, which projects into the nasal cavity.
  • nasal reflex
    sneezing caused by irritation of the nasal mucous membrane.
  • nasal region
    the region of the nose.

    Alternate names: regio nasalisTA

  • nasal ridge
  • nasal sacs
    the deepened nasal pits that develop into the definitive nasal cavities.
  • nasal septal branch of superior labial branch of facial artery
    branch of superior labial branch of facial artery that passes superiorly to ramify on the anteroinferior aspect of the nasal septum.

    Alternate names: ramus septi nasi arteriae labialis superiorisTA

  • Nasal septum

    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.

  • nasal spine of frontal bone
  • nasal surface of body 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.

    Alternate names: facies nasalis corporis maxillaeTA

  • nasal surface of horizontal plate of palatine bone
  • nasal surface of palatine bone
    the nasal surface of the perpendicular lamina of the palatine bone that forms part of the lateral wall of the nasal cavity (facies nasalis lamina perpendicularis ossis palatini [TA]); the nasal surface of the horizontal lamina of the palatine bone that forms part of the floor of the nasal cavity (facies nasalis lamina horizontalis ossis palatini [TA]).

    Alternate names: facies nasalis ossis palatiniTA

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