ORBIT & OCULAR ADNEXAE - Paranasal Sinuses Flashcards

1
Q

Which sinuses drain into…
1. the superior meatus
2. middle meatus
3. inferior meatus

A
  1. superior - sphenoid and posterior ethmoid
  2. middle - maxillary, anterior ethmoid, frontal
  3. inferior - opening of nasolacrimal duct
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2
Q

Which is the largest paranasal sinus?

A

Maxillary sinus

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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

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4
Q

Which paranasal sinuses are present at birth (3)

A
  1. ethmoid
  2. maxillary
  3. frontal (sometimes, usually at 2 years)
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5
Q

Which paranasal sinuses develop 2-3 years after birth (2)

A
  1. sphenoid
  2. frontal (usually at 2 years, sometimes at birth)
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