It consists of bony & cartilagenous parts:
The nasal cavity consists of 6 walls:
1-Anterior and posterior nares (aperture, choana).
2-Medial wall ; the septum.
|15||The medial wall, the septum|
The septum consists of:1-Quadrangular cartilage.2-Perpindicular plate of the ethmoid.3-Vomer.4-Maxillary crest.
It consists of 3 turbinates & meati: superior, middle and inferior.
|25||The paranasal sinuses (PNS)|
These are air filled spaces that :
1-lighten the skull.
2-Help in resonance of sound.
3-Insulates the brain from the atmospheric pressure.
4-Help in humidification of the inspired air.
It includes: maxillary, frontal, ethmoids and sphenoid sinuses.
-Pyramidal in shape:
-It is triangular in shape with base down:
-It lies within the body of sphenoid bone:
The openings of the paranasal sinuses in the middle & superior meati & sphenoethmoidal recess
Axial and coronal
|55||The normal endoscopic view|
|60||Blood supply of the nose|
The nose is supplied from:
1-Anterior and posterior ethmoid arteries from the ICA.
2-Greater palatine artery of maxillary (ECA).
3-Superior labial branch of facial artery (ECA).
4-Sphenopalatine artery of the maxillary (ECA).
The confleunce of the arteries is called the Little`s area (marked by red color).
|65||The mucociliary clearance|
|70||Examination of the nose|
Tools used for examination: the nasal speculum and the sinuscope.