ORBIT & OCULAR ADNEXAE - Paranasal Sinuses Flashcards
1
Q
Which sinuses drain into…
1. the superior meatus
2. middle meatus
3. inferior meatus
A
- superior - sphenoid and posterior ethmoid
- middle - maxillary, anterior ethmoid, frontal
- inferior - opening of nasolacrimal duct
2
Q
Which is the largest paranasal sinus?
A
Maxillary sinus
3
Q
What is the nerve supply of
1. Maxillary sinus (4)
2. Frontal sinus (1)
3. Sphenoid sinus (1)
4. Ethmoid sinus (3)
A
Maxillary: infraorbital, anterior/middle/ posterior superior alveolar nerves
Frontal: supraorbital nerve (ophthalmic)
Sphenoid: posterior ethmoidal nerve
Ethmoid: anterior and posterior ethmoidal nerves and pterygopalatine ganglion
4
Q
Which paranasal sinuses are present at birth (3)
A
- ethmoid
- maxillary
- frontal (sometimes, usually at 2 years)
5
Q
Which paranasal sinuses develop 2-3 years after birth (2)
A
- sphenoid
- frontal (usually at 2 years, sometimes at birth)