Nose: Paranasal Sinuses

Question 1

Paranasal sinuses

Answer 1

1. Air filled spaces in skull bones around nose (formed by absorption of spongy bony present between inner and outer tables of skull bones) lined with mucous membrane continuous with that of nose
2. Open in lateral wall nasal cavity by special foramina

Question 2

At birth

Answer 2

Absent at birth (except maxillary sinus) showing marked growth at time of permanent teeth eruption

Question 3

Functions

Answer 3

1. Decrease skull weight
2. Increase voice resonance
3. Increase surface area so warming and moistening inspired air