Nasal cavity

Dr Henry Knipe et al.

The nasal cavity forms part of the aerodigestive tract.

The nasal cavity is formed by 1:

In the midline, the nasal cavity is divided into right and left halves by a septum composed of fibrocartilage as well as the vomer and the perpindicular plate of the ethmoid bone

Anteriorly, it is continuous with the nose at the nasal aperture and posteriorly it is continuous with the nasopharynx. Laterally, the three nasal conchae form three spaces:

Connections
Arterial supply

The arterial supply of the nasal cavity is rich and derives from both the internal and external carotid arteries 4, 5:

Rich arterial supply results in two anastomotic areas, which are common sites of epistaxis 4:

  • Woodruff area: anastomosis of sphenopalatine and pharyngeal arteries in the inferior lateral nasal wall, posterior to the inferior turbinate
  • Kiesselbach plexus: anastomosis of the anterior ethmoid, greater palatine, sphenopalatine and superior labial arteries in the anteroinferior nasal septum (see article on Kiesselbach plexus)
Venous drainage

A rich venous submucosal venous network is formed by veins that accompany arteries. It should be noted that the posterior ethmoid veins anastomose with veins of the dura mater and orbit, making this a potential route of spread of infection. There is also an anastomosis with veins of the external nose 6.

The olfactory nerve (CN I) supplies the special sensation of smell to the olfactory epithelium in the roof of the nasal cavity, with fibres passing upwards through the cribriform plate to the olfactory bulb.

Mucosal somatic sensation of the nasal cavity is derived from numerous nerves, but in general terms the branches of the ophthalmic division of the trigeminal nerve (CN Va) supply the anterosuperier half whereas branches of the maxillary division of the trigeminal nerve (CN Vb) supply the posteroinferior half. More specifically:

  • anterior drainage: to the external nose 6
  • posterior drainage: via separate pathways to the lateral pharyngeal lymph nodes or deep cervical chain 6

Head and neck anatomy
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Article Information

rID: 29456
System: Head & Neck
Section: Anatomy
Tag: cases
Synonyms or Alternate Spellings:

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Cases and Figures

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    Figure 1
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    Figure 2: lateral nasal cavity wall
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