nose

Description

The nose is an amazingly complex instrument.
The insides of our noses are not just straight hollow tubes, but are shaped specifically to regulate airflow. A smooth bony constriction in the front has a smaller diameter than a human finger. This both protects the soft inner tissue from errant fingers and may act as a de Laval nozzle, increasing airspeed inside the nasal chamber.

The nasal root is the top of the nose, forming an indentation at the suture where the nasal bones meet the frontal bone. The anterior nasal spine is the thin projection of bone at the midline on the lower nasal margin, holding the cartilaginous center of the nose.

The internal human nose is a hollow structure above the roof of the mouth. The outer portion of the nose is the part you can see.
It is made from cartilage ( a soft rubbery tissue that gives it its shape ) which is attached to the skull at the nasal bone.
 Inside, the nose is divided into two cavities, leading from each nostril, which are separated by another strip of cartilage called the septum.
The inner nasal cavity is also connected to other cavities called sinuses. At the top of the inner cavity is the olfactory bulb, which contains the receptors that collect molecules and help you smell.
 The sinuses are lined with a mucous membrane which are soft, moist tissue covered with a layer of mucous. The tissue is also covered with microscopic hairs called cilia.

. The cilia wave back and forth, moving the mucous into the nasal cavity where it can capture dust, dirt, microorganisms, and pollen. The dirt-laden mucous is then flushed out to the stomach via the back of the throat. This is the way human body prevents bacteria from entering the body when breathing through the nose.
. The mucous in the  nasal cavity also helps to warm and moisten the air you breathe in, to help prevent damage to the  lung tissue. In order to smell something, molecules from the thing we smell have to enter the nose. Everything we smell, therefore, is giving off molecules( odorants ) . Those molecules are usually small, easy to evaporate chemicals that float through the air into the nose.

Memory is often associated with smell. Smell and memory are closely linked, although experts are not sure exactly how the process works. Smell can evoke memories, and our memory of odours seems to last longer than other memories. Like sound, odour is a memory cue.


Human nose shapes

There are virtually hundreds of shapes of noses out there.
The human nose takes on various shapes and sizes depending on cultural background, genetics and any injury or fractures.
 Every nose is unique in some way, making it a key tool for personal recognition and sometimes even an individuals’ trademark. Some people may be blessed with the perfect structure while others desperately yearn for a change.

Here are some of the common frames:


1. Flat human nose shapes


 -These shapes are a distinctive feature of Asian and African American faces.

 -The nostrils are normally wide and flared with a very short bridge and rounded tip.

 -A wide septum is also common.

2. Concave human nose shapes

- These shapes are a distincitive feature of  Caucasian people.

-Characterized by a curve which depresses in the middle with a protruding tip. The inward arching is normally caused by an overly bulky and bulbous tip.

- If the curve is slight, then this shape may actually look elegant.

3. Convex human nose shapes

-These shapes are a distinctive feature of Roman people.
-The nose is curved outwards in the centre area and protrudes too far from the face.

4.  Wavy human nose shapes

-A nose can have be wavy in two ways; looking front on or from a side view.

-Usually if the construction is warped from a frontal view, this is due to some injury or deformity.

- It can arise from nasal fracture or more commonly a genetic family trait.

-Saddle nose (boxer’s nose) is characterized by a bump towards the base where the nasal bones are located, then dips in the middle area and elevates once again at the tip.

5. Straight human nose shapes

-A lineal profile is commonly associated with narrow nostrils and a pointed tip.
-A straight nose is very desirable and appealing however an overly long dorsum can diminish the quality of this asset.