1-3. SUPRALARYNGEAL STRUCTURES (See Figure 1-2.)
a. External Nose. The external nose is the portion projecting from the face.
Primarily cartilages support it. It has a midline divider called the nasal septum, which
extends from the internal nose. Paired openings (nostrils lead to paired spaces
(vestibules). Guard hairs in the nostrils filter inflowing air.
Figure 1-2. Supralaryngeal structures.
b. Nasal Chambers (Internal Nose). Behind each vestibule of the external
nose is a nasal chamber. The two nasal chambers together form the internal nose.
These chambers too are separated by the nasal septum.
(1) Mucoperiosteum. The walls of the nasal chambers are lined with a thick
mucous-type membrane known as the mucoperiosteum. It has a ciliated epithelial
surface and a rich blood supply, which provides warmth and moisture. At times, it may
become quite swollen.
CILIATED = Provided with cilia (hair like projections that move
fluids to the rear)