Sinuses Flashcards
_____ are air-filled cavities located in the frontal, ethmoid, and sphenoid bones of the cranium, as well as the maxillae of the face
Paranasal siuses
Paranasal sinuses communicate with the _____ cavity
nasal
List the functions of the paranasal cavitites
- Serve as resonating chamber for the voice
- Decrease weight of skull
- Warm and moisturize inhaled air
- Act as shock absorbers in trauma
- Possibly control the immune system
____ sinuses are usually the only ones developed enough to be demonstrated radiographically at birth
maxillary sinuses
_____ is the largest and most symmetric sinus
Maxillary
pyramidal in shape
____ is the second largest sinus
Frontal sinus
True or false: frontal sinuses are always symmetric?
False = rarely
____ sinus is located below sella turcica and extend between dorsum and posterior ethmoids
Sphenoid sinus
Where are the ethmoid sinuses located at?
within lateral masses of labryinths
Ethmoid sinuses are composed of varying number of air cells that are divided into 3 main groups:
- ____
- ___
- ____
- Anterior (2-8)
- Middle ( 2-8)
- Posterior (2-6)
Why is it necessary to perform sinus projections upright?
to demonstrate fluid levels
Which projection demonstrates all 4 sets of sinuses?
Lateral
What is the term Antrum of Highmore?
Old term for maxillary sinuses
Which sinus projection best demonstrates the thickness of frontal bone
Lateral projection
For a lateral projection of the sinus, which side is best demonstrated
side closest to IR
