The Nasal Canal
الخيشوم
Al Khayshūm
The nasal cavities are two cuneiform cavities separated by a médian vertical partition and are covered with mucous membranes.
A nasal vibration is always very characteristic, the "nose twang".
The air passes through the nose when the veil of the palate, the muscular prolongation of the bone palate, is lowered:
Opening the oro-nasal passage!
Resonance in the phonatory apparatus:
The nasal cavity has dimensions and a fixed shape.
For an adult male, it has a length of about 12 cm and a volume of the order of 60cm cubes.
The sounds of the Nose
At the crossroads of the Pharynx, the passage of the air may indeed be effected in one or two directions, according to the position of the veil of the palate;
#If the veil of the palate is raised, access to the nasal cavity is blocked, and the air can only pass through the oral cavity, the letter is said to be oral.
#If the veil of the palate is lowered, part of the air will pass through the nasal fossae, the other part continuing its way through the oral cavity, the letter is said to be nasal.
The nasal cavity is the articulation area of the sounds:
# م ( Miim ), which corresponds to the english sound "m", it is a sound produced by compression of the lips on one another, it is called Bilabial.
# ن (Noun), which corresponds to the english "n" sound.
It is produced by sticking the tip of the tongue to the level of the upper incisor papillae,
Blocking the passage of air;
The latter will escape through the open nasal cavity, the veil of the palate being lowered.
The ن(Noun) is a so-called Dentale letter.
