Anatomy 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 opening (ostium) into the nasal cavity. To function normally and stay healthy, each nose cavity must be able to drain nasal mucus and exchange air through these openings.

The paranasal sinuses are composed of:

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

The Frontal Sinuses are located behind your eye brows 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. Here’s more info regarding oga max bán ở đâu stop by our own page.
The frontal sinuses are absent at birth, but are well-developed by age 8, and reach their full dimension around puberty. The frontal sinuses drain into the middle part of the sinus cavity.

The Maxillary Sinuses would be the largest of the paranasal sinuses. They may be 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 located high up on the sinus wall that sinuses do not drain well with all the head upright.

The Sphenoid Sinuses consist of one or two sinuses located deep behind the bridge of the nasal area in the sphenoid bone. These sinuses drain into the back part of the nasal cavity. 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 lining is composed of epithelium cells (with and without cilia), goblet cells, and basal cells. There are also wandering immune cellular material present (lymphocytes and mast cells). The sinus lining forms the physical barrier that keeps bacteria, pollutants and allergens from getting into our bloodstream and tissues.

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

prevent viruses and bacteria from sticking to the sinus lining
help our white blood cells to recognize infections and bacteria as invaders and also to kill them
The ciliated epithelial cells work together to sweep out there the mucus that has foreign materials and microorganisms. This process is known as mucociliary clearance. 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 purpose of the sinuses is unknown, yet here are some of the possible functions:

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



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