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Nasal cavity
Illu01 head neck.jpg
Head and neck.
Illu conducting passages.svg
Conducting passages
Details
Latin cavum nasi; cavitas nasi
Identifiers
Gray's p.994
MeSH A04.531.449
TA A06.1.02.001
FMA 54378
Anatomical terminology

The nasal cavity (or nasal fossa) is a large air filled space above and behind the nose in the middle of the face. Each cavity is the continuation of one of the two nostrils.

Function[edit]

The term "nasal cavity" can refer to each of the two sides of the nose or to the two sides combined, the former usage being more commonly applied to living persons and the latter usage being more commonly applied to dried skull anatomy. The two nasal cavities condition the air to be received by the other areas of the respiratory tract. Owing to the large surface area provided by the nasal conchae (also known as turbinates), the air passing through the nasal cavity is warmed or cooled to within 1 degree of body temperature. In addition, the air is humidified, and dust and other particulate matter is removed by vibrissae, short, thick hairs, present in the vestibule. The entire mucosa of the nasal fossae is covered by a blanket of mucus, which lies superficial to the microscopic cilia and also filters inspired air, The cilia of the respiratory epithelium move the secreted mucus and particulate matter posteriorly towards the pharynx where it passes into the esophagus and is digested in the stomach. The nasal cavity also houses our sense of smell and contributes greatly to taste sensation through its posterior communication with the mouth via the choanae.

Walls[edit]

The lateral wall of each nasal cavity is mainly made up by the maxilla, however there is a deficiency that is compensated by: the perpendicular plate of the palatine bone, the medial pterygoid plate, the labyrinth of the ethmoid and the inferior concha. The paranasal sinuses are connected to the nasal cavity through small orifices called ostia. Most of these ostia communicate with the nose through the lateral nasal wall, via a semi-lunar depression in it known as the infundibulum. The infundibulum is bound laterally by a projection known as the uncinate process.

The roof of each nasal cavity is formed in its upper third to one half by the nasal bone and more inferiorly by the junctions of the upper lateral cartilage and nasal septum. Connective tissue and skin cover the bony and cartilaginous components of the dorsum of the nose.

The floor of the nasal cavities, which also form the roof of the mouth, is made up by the bones of the hard palate: the horizontal plate of the palatine bone posteriorly and the palatine process of the maxilla anteriorly. To the front of the nasal cavity is the nasal vestibule and external opening, while the back blends, via the choanae, into the nasopharynx.

The nasal cavity is divided in two by a vertical fin called the nasal septum. On the sides of the nasal cavity are three horizontal outgrowths called nasal conchae (singular "concha") or turbinates. These turbinates disrupt the airflow, directing air toward the olfactory epithelium on the surface of the turbinates and the septum. The vomeronasal organ is located at the back of the septum and has a role in pheromone detection.

Cilia and mucus[edit]

Cilia and mucus along the inside wall of the nasal cavity trap and remove dust and pathogens from the air as it flows through the nasal cavity. The cilia move the mucus down the nasal cavity to the pharynx, where it can be swallowed.

Segments[edit]

The nasal cavity is divided into two segments: the respiratory segment and the olfactory segment.

  • The respiratory segment comprises most of each nasal fossa and is lined with ciliated pseudostratified columnar epithelium (also called respiratory epithelium). The conchae, or turbinates, are located in this region. The turbinates have a very vascularized lamina propria (erectile tissue) allowing the venous plexuses of their mucosa to engorge with blood, restricting airflow and causing air to be directed to the other side of the nose, which acts in concert by shunting blood out of its turbinates. This cycle occurs approximately every two and a half hours.
  • The olfactory segment is lined with a specialized type of pseudostratified columnar epithelium, known as olfactory epithelium, which contains receptors for the sense of the smell. This segment is located in and beneath the mucosa of the roof of each nasal cavity and the medial side of each middle turbinate. Histological sections appear yellowish-brown due to the presence of lipofuscin pigments. Olfactory mucosal cell types include bipolar neurons, supporting (sustentacular) cells, basal cells, and Bowman's glands. The axons of the bipolar neurons form the olfactory nerve (cranial nerve I) which enters the brain through the cribiform plate. Bowman's glands are serous glands in the lamina propria, whose secretions trap and dissolve odoriferous substances.

Blood supply[edit]

There is a rich blood supply to the nasal cavity. In some animals, such as dogs, the capillary beds flowing through the nasal cavity help cool the blood flow to the brain.

Blood supply comes from branches of both the internal and external carotid artery, including branches of the facial artery and maxillary artery. The named arteries of the nose are:

Innervation[edit]

Innervation of the nasal cavity responsible for the sense of smell is via the olfactory nerve, which sends microscopic fibers from the olfactory bulb through the cribriform plate to reach the top of the nasal cavity.

General sensory innervation is by branches of the trigeminal nerve (V1 & V2):

There are two passages in the nasal cavity, not to be confused with nostrils.The entire nasal cavity is innervated by autonomic fibers. Sympathetic innervation to the blood vessels of the mucosa causes them to constrict, while the control of secretion by the mucous glands is carried on postganglionic parasympathetic nerve fibers originating from the facial nerve.

Diseases[edit]

Diseases of the nasal cavity include viral, bacterial and fungal infections, nasal cavity tumors, both benign and much more often malignant, as well as inflammations of the nasal mucosa. Many problems can affect the nose, including:

Additional images[edit]

See also[edit]

External links[edit]

  • lesson9 at The Anatomy Lesson by Wesley Norman (Georgetown University)
  • Gross anatomy dissection of the nasal cavity, video [1] and [2]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Nasal_cavity — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

2462 news items

Daily Mail

Daily Mail
Thu, 26 Mar 2015 04:28:54 -0700

After putting a camera into the man's nose, more than 100 maggots were found in his left nasal cavity. His nasal passage was red, filled with fluid, covered in ulcers and the tissue was crumbling. Doctors cleared away the maggots individually, guided ...

The Mary Sue

The Mary Sue
Fri, 17 Apr 2015 17:00:46 -0700

In species with a feeble sense of smell, such as humans, simpler olfactory structures are located on the upper part of the nasal cavity, which carries both olfactory and respiratory air streams. In contrast, animals with a keen sense of smell, such as ...

The Spokesman Review

The Spokesman Review
Thu, 16 Apr 2015 23:56:15 -0700

Surgeons hope to remove damaged scar tissue and bone fragments from Theia's injuries and insert a small tube into her nasal cavity to help keep her airway open. “I will be driving Theia myself to Pullman on Tuesday and checking her in and meeting with ...

Sampan

Sampan
Fri, 17 Apr 2015 05:11:15 -0700

Nasopharyngeal carcinoma (NPC) is a type of cancer that arises from the back of the nasal cavity, above the back of the throat. This type of cancer is common in southern China (including Hong Kong and Guangdong) and Southeast Asia (including Vietnam).

Tahoe Daily Tribune

Tahoe Daily Tribune
Thu, 16 Apr 2015 10:37:30 -0700

April 12 to 18 is national Oral, Head, and Neck Cancer Awareness Week. Cancer from the neck up is typically associated with the tongue, throat, and voice box. But oral, head, and neck cancers can also occur in the mouth, lips, thyroid glands, nasal ...

Fox News

Fox News
Tue, 31 Mar 2015 06:56:25 -0700

In addition to missing an external nose, Eli was born without a nasal cavity or olfactory system. McGlathery has heard him sneeze, though. "The first time he did it, we looked at each other and said, 'You heard that, right?'" she told AL.com. The ...
 
News & Observer
Sat, 11 Apr 2015 21:09:50 -0700

West, who Miragliuolo said suffered a broken nasal cavity and fractured cheek, retired five of the six batters he faced in relief of Chris Joyner, who allowed just two hits. West played with a protective guard on his batting helmet. Blake: 919-460-2606 ...

Pharmacy Times (registration)

Pharmacy Times (registration)
Mon, 13 Apr 2015 14:22:30 -0700

Sinusitis can be caused by viruses, bacteria, fungi, allergens, pollutants (smoke and other airborne chemicals or irritants), periapical or periodontal infections, structural problems with the Eustachian tube or the nasal cavity (eg, deviated nasal ...
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