Body structure of the Paranasal Sinuses

The hollow air spaces in the body are known as sinuses. There are about 60 sinuses spread throughout your body. If you think of “sinusitis” or “sinus infection”, you are talking about the paranasal sinuses. Each of the paranasal sinuses has an starting (ostium) into the nasal cavity. To work normally and stay healthy, each sinus cavity must be able to drain mucus and exchange air through these types of openings.

The paranasal sinuses are composed of:

Ethmoid sinuses
Frontal sinuses
Maxillary sinuses
Sphenoid sinuses
The particular Ethmoid Sinuses are located behind the particular bridge of the nose in the ethmoid bone. These sinuses consist of 6-12 thin-walled cavities. These are divided into anterior, middle and posterior groups. The posterior group drains to the nasal cavity towards the rear. Occasionally one or more of the posterior group opens into the sphenoid sinus. The middle team and anterior group drain in to the middle of the nasal cavity.

The Frontal Sinuses are located behind your eyebrows in the frontal bone. They can vary in size from left to correct and in about 5% of people they are not present at all. The frontal sinuses are absent at birth, but are well-developed by age 8, and reach their full size around puberty. The frontal sinuses drain into the middle part of the sinus cavity.

The Maxillary Sinuses are the largest of the paranasal sinuses. They are located behind each cheekbone and so are roughly triangular in shape. The maxillary sinuses drain into the middle k?rester t of the nasal cavity. The opening into the nasal cavity is found high up on the sinus wall and these sinuses do not drain well using the head upright.

The Sphenoid Sinuses consist of one or two sinuses located serious behind the bridge of the nose in the sphenoid bone. These sinuses drain into the back part of the nasal hole. The openings of the sphenoid sinuses are also located high on sinus wall structure and do not drain well when the mind is upright.

The sinus liner is composed of epithelium cells (with and without cilia), goblet cells, and basal cells. There are also wandering immune tissue present (lymphocytes and mast cells). The sinus lining forms the physical barrier that keeps bacterias, pollutants and allergens from entering our bloodstream and tissues.

The particular sinus lining also produces mucus from the goblet cells. This nasal mucus traps the pollutants, bacteria plus allergens. The mucus also has exclusive antibodies and enzymes that;

avoid viruses and bacteria from sticking to the sinus lining
help the white blood cells to recognize viruses and bacteria as invaders and also to kill them
The ciliated epithelial cells work together to sweep out there the mucus that has foreign components and microorganisms. This process is known as mucociliary clearance.
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These ciliated cells are very sensitive to humidity, pollutants plus toxins. If they don’t function well, we are able to expect sinus infections to occur.

The objective of the sinuses is unknown, yet here are some of the possible functions:

Makes the front of the skull lighter
The actual voice more resonant
Provide a crumple zone for facial blows
Protects the eyes and teeth from rapid temperature changes
Heating plus moistening incoming air

Sinusitis