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What do the paranasal sinuses drain?

What do the paranasal sinuses drain?

The sphenoid sinuses are located centrally and posteriorly within the sphenoid bone. They drain into the sphenoethmoidal recess located within the superior meatus. The sphenopalatine artery supplies the sinus, and venous drainage is via the maxillary vein.

Do the paranasal sinuses drain fluid from the nose?

They are located laterally and slightly inferiorly to the nasal cavities. They drain into the nasal cavity at the hiatus semilunaris, underneath the frontal sinus opening. This is a potential pathway for spread of infection – fluid draining from the frontal sinus can enter the maxillary sinus.

Which paranasal sinuses do the humans have?

Humans have four types of sinuses that play a role in sinus headaches: the frontal sinus in the forehead, the maxillary sinus in the cheeks, the ethmoid sinus between the eyes and the sphenoid sinus behind the nose. The African apes, gorillas and chimpanzees, have all four of these sinuses.

What is the meaning of paranasal sinus?

Definition: paranasal sinuses. paranasal sinuses. Four pairs of hollow, air-filled spaces located within the bones of the face that surround the nasal cavity and are connected to the nose by small openings. They are named the frontal, maxillary, ethmoid, and sphenoid sinuses.

Why are humans prone to sinus infections?

If you have a weak immune system, you are more likely to develop sinus infection from bacteria or mold. Other things that can cause sinus infections are colds, seasonal allergies, nasal polyps or a deviated septum.

What are the four paranasal sinuses and their location?

Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located under the eyes; the frontal sinuses are above the eyes; the ethmoidal sinuses are between the eyes and the sphenoidal sinuses are behind the eyes.

What are the functions of the paranasal sinus?

Functions: What do the paranasal sinuses do. The mucus lining of the sinuses helps in purifying the air, as all dust and other harmful particles stick to the mucus, to be brushed out of the body through the nasal cavity [6].

Where do the sinuses drain back into the nasal cavity?

All the sinuses therefore drain back into the nasal cavity – openings to the paranasal sinuses can be found on the roof and lateral nasal walls. In this article, we shall look at the anatomy of the paranasal sinuses – their structure, anatomical relations and innervation.

What is the function of the sinuses in the skull?

There are four paired sinuses, named according to the bone in which they are located; maxillary, frontal, sphenoid and ethmoid. The function of the sinuses is not clear. It is thought that they may contribute to the humidifying of the inspired air. They also reduce the weight of the skull.

Can a sinus infection spread to the nasal cavity?

As the paranasal sinuses are continuous with the nasal cavity, an upper respiratory tract infection can spread to the sinuses. Infection of the sinuses causes inflammation (particularly pain and swelling) of the mucosa, and is known as sinusitis.