What are the Sinuses?

what are the sinuses and where are they located

Sinus and Nasal Cavity Location

The nasal sinuses are interconnected spaces in the skull that  are lined with respiratory tissue (mucosa). These sinuses range in size from several centimeters to only a few millimeters. Tiny channels (osteomeatal complexes) connect each of the sinuses and drain to the inside of the nose. The sinuses are shown below.

All sinuses are paired. The maxillary sinuses are the largest sinuses and located below the eyes in the cheeks. The frontal sinuses are in the frontal bone in the forehead. The ethmoid sinuses may be three to ten on each side and are found between the eyes behind the top of the nose. The sphenoid sinuses (not shown here) are at the back of the nasal cavity in the middle of the head.

The left and right sinuses and nasal cavities are divided by a wall of cartilage and bone called the nasal septum. When the nasal septum becomes shifted this can cause what is known as a deviated septum and may require surgery. The turbinates are ridges of bone covered with mucosa and are located on the lateral walls of the nasal cavity from the front to the back of the nose.

How do the sinuses work

The surfaces of the sinuses and the inside of the nose are covered with a very specialized mucosa. This mucosa has tiny scrubbers called cilia that direct the flow of mucus and dirt from the sinuses into the nasal cavity and to the back of the throat where it can be swallowed. A sticky layer of mucus coats the cilia and prevents particles and bacteria from getting into the sinuses. One liter of mucus is made per day to help keep the sinuses clean. The mucosa of the nose helps to warm and humidify as well as purify the air we breathe.

The maxillary, frontal and anterior ethmoid cells drain through a common osteomeatal complex into the anterior nasal cavity. The posterior ethmoids and sphenoid sinuses drain into the posterior nasal cavity.

parts of the sinus

What is sinusitis?

Swelling of the nasal mucosa for any reason may prevent the sinuses from draining normally. When bacteria or viruses are not being cleared from the sinuses and stagnate, they can multiply, cause pus with more inflammation, and become a sinus infection (sinusitis). Because the connecting channels inside the nose may only be a few millimeters or less, even a small amount of swelling can cause sinusitis. A common cold lasting greater than several days may be undiagnosed sinusitis.

maxillary_sinus_image

The reasons for mucosal swelling and potentially bacterial sinusitis are numerous. Allergies, irritation of the nose by inhaled dust, a viral infection, drinking alcohol, dry air, headaches, perfume, smoke, stress, and spicy foods, to name a few. Narrow anatomy of the nose can predispose to sinus infections. This can include a deviated septum, turbinate hypertrophy, thickened mucosa, nasal polyps and abnormally thin sinus channels.

What are deviated septum and turbinate hypertrophy?

A deviated nasal septum is when the bone or cartilage dividing the middle of the nose is twisted to the left or right. Enlarged turbinates, or turbinate hypertrophy, occurs when the mucosa or bone of the ridges on the lateral sides of the nose blocks airflow.These conditions can prevent normal mucus draining from the nose that can cause sinusitis. They also can cause snoring, sleep  apnea, and nasal obstruction.

What are the signs and symptoms of sinusitis?

healthy and inflamed sinuses

Thick nasal drainage – During sinusitis, the mucous from the nose may be yellow or green colored, have a bad odor, and be thicker and more copious than normal.

Headaches, facial, dental or sinus pain – The pressure of the pus pushing on the delicate nasal and sinus passages can cause severe headaches, cheek and forehead pain, and toothaches especially in the back upper teeth.

Worsened nasal obstruction and congestion – Inflammation and swelling in the nose and sinuses will block airflow and the natural drainage pathways of the sinuses. There may be baseline congestion from a deviated septum that is magnified by the swelling of a sinus infection.

Fatigue – Your body uses a lot of energy when it is fighting an infection, which explains why you may feel weaker or have trouble focusing  when you are sick. Sleeping can also become more difficult due to post nasal drip and nasal obstruction.

Decreased sense of taste or smell – The sense of smell requires that nasal mucosa be functioning properly. Anything that congests the nose will decrease one’s sense of smell . Our sense of smell is what allows our taste buds to be able to pick up the subtleties from food or drink. When we are unable to smell normally, food often tastes bland, or like nothing at all, making meals less enjoyable or even reducing your appetite.

How is sinusitis treated?

A mild case of sinusitis may be resolved either with no treatment or through an over-the-counter (OTC), prescribed medication. A more severe, acute sinus infection can be treated with an antibiotic that addresses the most common bacterial causes of infection. Additional improvement may be obtained by a combination  of antihistamines, oral and topical decongestants, steroid nasal sprays, saline rinses and environmental controls. Failure of maximal medical management may require additional testing including a nasal endoscopy or a sinus CAT scan to look for the causes and location of the infection.

When is sinus surgery necessary?

healthy sinus catscan

Open Healthy Airways

After maximal medical management has failed, having sinus surgery may be needed to decrease, minimize, or eliminate the occurrence of sinus infections. A functional endoscopic sinus surgery (FESS) opens obstructions inside the nasal passages to allow each sinus to be aerated and drain through its natural or surgically-made sinus opening. Straightening the deviated nasal septum(septoplasty), and reducing the inferior turbinates (turbinoplasty), may be required as well to improve breathing and ventilation to the sinuses. The crooked cartilage and bone of the deviated septum, and the thickened bone and mucosa of the sinuses can be removed using microinstruments and high-powered endoscopes. The procedures take about an hour at an ambulatory surgery center usually requires general anesthesia. You will go home about an hour after surgery.

How is the recovery from sinus surgery?

Dr. Bennett uses the most advanced sinus surgical techniques available. He does not pack the nose. He finds that the placement of nasal packing and associated discomfort is rarely needed. No packing in the nose improves the overall experience and allows for a more rapid recovery. A headache for a couple of days and nasal congestion for at least the first week are common. Patients will generally return to normal activity in 7-10 days.

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Castle Connolly Top Doctor 2016

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Dr. Bennett has been awarded the peer reviewed honor of being a 2016 NY Castle Connolly Top Doctor.

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