Paranasal sinuses
Paranasal Sinuses
The Paranasal Sinuses (/pærəˈneɪzəl ˈsaɪnəsɪz/; from Greek para, meaning "beside", and nasal, meaning "nose") 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.
Etymology
The term "Paranasal" is derived from the Greek words para (beside) and nasal (nose), indicating their proximity to the nasal cavity. "Sinus" is a Latin term meaning "pocket" or "curve", which describes the shape and location of these structures.
Anatomy
The paranasal sinuses are divided into four pairs: the maxillary sinuses, the largest and most commonly known; the frontal sinuses, located in the forehead; the ethmoid sinuses, located between the eyes; and the sphenoid sinuses, located behind the eyes. Each sinus is connected to the nasal cavity by small channels or ducts which allow for the exchange of air and mucus.
Function
The primary function of the paranasal sinuses is to produce a mucus that moisturizes the inside of the nose. This mucus layer protects the nose from pollutants, micro-organisms, dust, and dirt. Sinuses also play a role in our voices by acting as resonating chambers.
Related Terms
- Nasal cavity: The large air-filled space above and behind the nose in the middle of the face.
- Maxillary sinuses: The largest of the paranasal sinuses, located under the eyes.
- Frontal sinuses: These sinuses are located in the forehead.
- Ethmoid sinuses: These sinuses are located between the eyes.
- Sphenoid sinuses: These sinuses are located behind the eyes.
External links
- Medical encyclopedia article on Paranasal sinuses
- Wikipedia's article - Paranasal sinuses
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