Table 2 Thirteen cross-sections of upper airway.

From: Upper airway flow characteristics of childhood obstructive sleep apnea-hypopnea syndrome

Cross-section

Location

Cross-section

Location

Cross-section

Location

1

Anterior naris

6

End Inferior turbinate

11

Tonsil midsection

2

Nasal limen

7

Posterior naris

12

Hypopharyngeal beginning

3

Anterior inferior turbinate

8

Nasopharyngeal beginning

13

Tracheal beginning

4

Anterior middle turbinate

9

Adenoid

5

Middle inferior turbinate

10

Oropharyngeal beginning