Maxillary Sinus

Question 1

What are the functions of the paranasal sinuses?

Answer 1

Resonance of voice

Reserve chambers for warming inspired air

Reduce the weight of the skull

Question 2

Where does the maxillary sinus drain to?

Answer 2

Drains into the nasal cavity via the semilunar hiatus.

Approximately 4mm diameter.

Question 3

Where is the semilunar hiatus located?

Answer 3

Superiorly on medial wall of the sinus.
- so if there is a build up of mucous in the sinus or blood or other fluid- it will have to reach. high level before it goes into the nose.

Can become narrow or blocked during episodes of inflammation/disease.

Question 4

What type of epithelium covers the sinus walls?

Answer 4

Pseudostratified ciliated columnar epithelium.

The cilia mobilise trapped particulate matter and foreign material within the sinus.

Move this material toward the Ostia for elimination into the nasal cavity.