Paransal Air Sinuses Flashcards
What is a paranasal air sinus?
Outgrowths of the nasal cavity which contain air
What is a sinus lined with?
Continuation of nasal mucous membrane (ciliated columnar epithelium)
What sinus is present at birth
Maxillary sinus
When do the frontal and sphenoid sinuses become visible on a radiograph?
6/7 years of age
What sinus devlops last?
Ethmoid sinus
What are the different kinds of paranasal air sinuses
- maxillary sinus (2)
- frontal sinus (usually 2)
- ethmoid sinus (many)
- sphenoid sinus
Where are maxillary sinuses located?
Within the body of each maxillary bone
What is the maxillary sinus also called?
Antrum of highmore
Where is the anterior maxillary sinus situated?
The anterior maxillary sinus is bounded by the facial surface of maxilla
Where is the posterior maxillary sinus located?
The posterior maxillary sinus is related to the pterygopalatine fossa
What are the complications that can arise with the maxillary sinus?
- complications can occur when extracting upper molars (oral antral fistula)
- sinusitis can occur
Where are frontal sinuses located?
Frontal sinuses occupy bone above superior surface of orbit, posterior to the glabella
Where are the ethmoid sinuses located?
Within the lateral masses of the ethmoid bone
Where are sphenoid sinuses located?
They lie in the body if the sphenoid bone directly below the sella turcica
What are the functions of the paranasal air sinuses?
- aid in cleaning nasal passages
- provide resonance to voice
- reducing total weight of head
- insulates brain from extreme temperatures
