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Flashcards in Paranasal Sinuses Deck (21):
1

Names of the paranasal sinuses?

Maxillary
Frontal
Sphenoid
Ethmoid

2

What is the function of the sinuses thought to be?

Contribute to humidifying the inspired air
Reduce weight of the skull

3

How are the sinuses formed?

During childhood, the nasal cavity erodes into the surrounding bone

4

Where, in general, are the openings into the nasal cavity found?

Roof and lateral walls of the cavity

5

What is the inner surface of the paranasal sinuses lined with?

Respiratory mucosa

6

What shape are the frontal sinuses?

Triangular

7

Where do the frontal sinuses drain into and via what?

Via the frontonasal duct which opens out at the hiatus semilunaris on the lateral wall

8

At what level do the sphenoid sinuses lie?

At the level of the sphenoid-ethmoidal recess

9

Where are the sphenoid sinuses located?

Superiorly
More posteriorly
Related superiorly and laterally to the cranial cavity

10

Where do the sphenoid sinuses drain into?

The roof of the nasal cavity

11

What is near the sphenoid sinuses which makes them clinically important?

Pituitary gland which can be surgically accessed through the sphenoid sinus and sphenoid bone

12

How many ethmoidal sinuses are there? Name them

Three
-anterior
-middle
-posterior

13

Where does each ethmoidal sinus drain into?

Anterior - hiatus semilunaris
Middle - ethmoid bulla
Posterior - superior meatus

14

Where are the maxillary sinuses located?

Laterally and slightly inferiorly to the nasal cavities

15

Where do the maxillary sinuses drain into?

At the hiatus semilunaris - underneath the frontal sinus opening

16

Pinkerton can easily spread between two of the sinuses. Which are they and why?

The frontal sinus and maxillary sinus
Fluid draining the frontal sinus can easily go into the maxillary sinus because the opening for the maxillary is just underneath the one for the frontal

17

What is sinusitis?

When infection of the upper respiratory tract spreads to the sinuses
Causes inflammation, pain and swelling of the mucosa

18

What is it called if more than one sinus is infected by sinusitis?

Pansinusitis

19

Why can inflammation of one of the sinuses present as toothache?

The maxillary nerve supplies both the maxillary sinus and maxillary teeth

20

Which of the sinuses is the largest?

The maxillary

21

How many paranasal sinuses are there?

Four paired