nasal septum

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septum

 [sep´tum] (L.)
1. a wall or partition dividing a body space or cavity. Some are membranous, some are osseous, and some are cartilaginous; each is named according to its location. See also septal defect. adj., adj sep´tal.
alveolar septum interalveolar septum.
atrial septum (septum atrio´rum cor´dis) interatrial septum.
atrioventricular septum the part of the membranous portion of the interventricular septum between the left ventricle and the right atrium.
deviated septum an injury or malformation of the nasal septum so that one part of the nasal cavity is smaller than the other; this is fairly common and seldom causes complications. Occasionally the deviation may handicap breathing, block the normal flow of mucus from the sinuses during a cold, or prevent proper drainage of infected sinuses. In some cases surgery (called partial or complete submucous resection) may be necessary to relieve the obstruction and reduce irritation and infection in the nose and sinuses.
interalveolar septum
1. one of the thin plates of bone separating the alveoli of the teeth in the mandible and maxilla. Called also interradicular septum.
2. one of the thin septa that separate adjacent pulmonary alveoli, containing connective tissue and the capillary network of the blood supply of the lung. Defs. 1 and 2 called also alveolar septum.
interatrial septum (septum interatria´le cor´dis) the partition separating the right and left atria of the heart; called also atrial septum.
interradicular septum interalveolar septum (def. 1).
interventricular septum (septum interventricula´re cor´dis) the partition separating the right and left ventricles of the heart; called also ventricular septum.
nasal septum a plate of bone and cartilage covered with mucous membrane that divides the nasal cavity.
septum lu´cidum septum pellucidum.
pellucid septum (septum pellu´cidum) the triangular double membrane separating the anterior horns of the lateral ventricles of the brain; called also septum lucidum.
septum pri´mum a septum in the embryonic heart, dividing the primitive atrium into right and left chambers. See also congenital heart defect.
rectovaginal septum the membranous partition between the rectum and vagina.
rectovesical septum a membranous partition separating the rectum from the prostate and urinary bladder.
septum of ventricles of heart (ventricular septum) (septum ventriculo´rum cor´dis) interventricular septum.

na·sal sep·tum

[TA]
the wall dividing the nasal cavity into halves; it is composed of a central supporting skeleton covered on each side by a mucous membrane.
Synonym(s): septum nasi [TA]

nasal septum

the partition dividing the nostrils. It is composed of bone and cartilage covered by mucous membrane.
enlarge picture
Nasal septum

nasal septum

A flat, vertically oriented bony and cartilaginous partition located in the middle of the nose, which divides it into 2 lateral cavities, each ending in a nostril.
 
Boundaries
•  Posterior—Vomer
• Anterosuperior—Perpendicular plate of ethmoid
• Anteroinferiorly—Septal cartilage

na·sal sep·tum

(nā'zăl sep'tŭm) [TA]
The wall dividing the nasal cavity into halves; it is composed of a central supporting skeleton covered on each side by a mucous membrane.

nasal septum

The thin, central partition that divides the interior of the nose into two passages. The septum consists of a thin plate of bone, behind, and a thin plate of cartilage in front. Both are covered with MUCOUS MEMBRANE. Deflection of the septum to one side (deviated septum) is common and usually harmless.

Nasal septum

The cartilage which divides the nose in half.

na·sal sep·tum

(nā'zăl sep'tŭm) [TA]
The wall dividing the nasal cavity into halves; it is composed of a central supporting skeleton covered on each side by a mucous membrane.

nasal septum,

n the partition dividing the nostrils. It is composed of bone and cartilage covered by mucous membrane.

nasal

pertaining to the nose.

nasal acariasis
characterized by mild nasal discharge and hyperemia, occasionally severe rhinitis. See also pneumonyssuscaninum.
nasal actinobacillosis
a chronic granulomatous lesion in the nasal cavity of the sheep, causing nasal obstruction and discharge, usually unilaterally.
nasal amyloidosis
in horses analogous to AL-amyloidosis in humans; can occur independently of a generalized disease, affecting nasal vestibule and anterior septum and turbinates, with sufficient nodular or diffuse deposits to obstruct the nasal passage.
nasal areae, nasal plane
the polygonal, raised, epidermal markings on the skin of the nasolabial plane of the dog. The pattern of marking is individual to each dog and can be used for identification, similar to the use of fingerprints in humans.
nasal bot fly
infestation causes sneezing and constant nasal discharge. The presence of the flies in the flock causes some insect worry. See also oestrusovis.
nasal breath
flow of the breath from the nostrils as distinct from the breath from the mouth.
nasal breath volume
as determined by holding the palms of the hands in front of the nostrils; diminution or cessation of flow are readily appreciated.
nasal catarrh
chronic nasal discharge without obvious physical cause. A specific problem of unknown etiology in rabbits, although Bordetella bronchiseptica is thought to be implicated. Manifested by sneezing, constant nasal and ocular discharge and matting of the fur on the insides of the forelimbs. Called also snuffles.
nasal cavity erectile tissue
erectile tissue present only in some patients; usually collapsed.
nasal cavity hemorrhage
nasal cavity obstruction
by mucosal inflammation, foreign body, neoplasm; detected by assessing the nasal breath flow.
nasal cavity olfactory region
located on ethmoturbinates, turbinates and nasal septum; covered by olfactory epithelium including sustentacular, basal and olfactory cells.
nasal cavity respiratory region
covers most of the cavities; covered by respiratory epithelium containing many, mainly serous, glands and carrying cilia.
nasal cavity-sinuses
see paranasal sinuses.
nasal cavity vestibular region
place of transition from skin to respiratory epithelium.
nasal conchae
see Table 10.
nasal cycling
reciprocal change in degree of congestion between nostrils; when the mucosa of one nasal cavity becomes congested the mucosal congestion of the opposite nasal cavity diminishes.
nasal deviation
1. occurs as a congenital deviation of the maxilla and nasal septum and leads to malocclusion of the maxillary teeth.
2. in older animals can result from paranasal sinus cysts or sinonasal neoplasia.
Enlarge picture
Nasal deviation in a horse. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003
nasal discharge
may be unilateral or bilateral, serous, purulent, hemorrhagic, or contain food material.
nasal diverticulum
see nasal diverticulum.
encapsulated nasal hematoma
persistent because of its size; blood is accumulated under respiratory mucosa so as to resemble a polyp. Like a polyp the hematoma obstructs the flow of breath through the nasal cavity.
enzootic nasal adenocarcinoma
of sheep and cattle may occur at a sufficiently high incidence to suggest an infectious cause. Usually unilateral in front of the ethmoid bone.
nasal fold
see facial fold1.
nasal foreign bodies
take the form of grass seeds or sticks poked up while the animal is scratching its muzzle in allergic rhinitis, especially in cattle. Cause sneezing, nasal discharge, inspiratory dyspnea, snoring noise and rubbing of the nose. Foreign bodies may be viewable or palpable.
nasal fossa
see nasal fossa.
nasal fundus
the caudal part of the nasal cavity, close to the ethmoid bone.
nasal granuloma
see enzootic nasal granuloma, mycotic nasal granuloma, schistosomanasalis.
nasal hematoma
cause unilateral nasal obstruction; are usually the result of foreign body injury, rarely due to inept passage of a nasal tube or endoscope.
nasal hemorrhage
see epistaxis. Called also rhinorrhagia, nose bleed.
nasal meatus
see nasal cavity.
nasal mites
see nasal acariasis (above).
nasal mucosal inflammation
nasal obstruction
causes respiratory stertor, mouth breathing, and small airstreams from the nostrils. It may be caused by a palpable foreign body.
nasal odor
smell of the nasal breath; may be necrotic, smell of ketones.
nasal passage
see nasal cavity.
nasal plane
see nasal plane.
nasal polyp
see nasal polyp.
progressive nasal hematoma
see progressive nasal hematoma.
nasal schistosomiasis
infection with the blood fluke schistosoma, which is largely asymptomatic but can cause dyspnea, snoring and profuse nasal discharge.
nasal septum
a vertical plate of bone and cartilage covered with mucous membrane that divides the cavity of the nose. See also septum.
nasal sinus
see paranasal sinus.
nasal swab
cotton swab on a stick, passed up the nostril to obtain a sample of exudate and epithelial debris for microbiological or cellular examination.
nasal tube
see nasogastric tube.
nasal turbinates
see nasal conchae (above) and Table 10.
nasal vestibule
the part of the nasal cavity just inside the nostrils that is lined with skin.
nasal wash
flushing of the nasal cavity, usually with sterile saline, to recover cells or infectious agents for cytology or culture.