2. Nasopharynx
Nasal cavity
Pharynx
Nostril
Oropharynx
Larynx
Laryngopharynx
Trachea
Left main
(primary)
bronchus
Right main
(primary)
bronchus
Left lung
Right lung
Diaphragm

4. Pharynx
Nasopharynx
Oropharynx
Laryngopharynx

6. Nasal cavity
Pharynx
Posterior nasal
aperture
Nasal conchae
(superior, middle
and inferior)
Nasopharynx
Nasal meatuses
(superior, middle,
and inferior)
Nasal vestibule
Uvula
Nostril
Oropharynx
Isthmus of the
fauces
Laryngopharynx
Epiglottis
Vestibular fold
Larynx
Thyroid cartilage
Vocal fold
Cricoid cartilage
Trachea

8. Epiglottis
Thyroid cartilage
Laryngeal prominence
(Adam’s apple)
Cricoid cartilage
Tracheal cartilages

10. Epiglottis
Cuneiform cartilage
Vestibular fold
(false vocal cord)
Corniculate cartilage
Arytenoid cartilage
Thyroid cartilage
Vocal fold
(true vocal cord)
Cricoid cartilage
Tracheal cartilages

12. Intercostal
muscle
Rib
Parietal pleura
Trachea
Lung
Pleural cavity
Visceral pleura
Apex of lung
Horizontal fissure
Oblique
fissure
Oblique fissure
Diaphragm
Base of lung
Cardiac notch

14. Trachea
Superior lobe
of left lung
Left main
(primary)
bronchus
Superior lobe
of right lung
Lobar
(secondary)
bronchus
Segmental
(tertiary)
bronchus
Middle lobe
of right lung
Inferior lobe
of right lung
Inferior lobe
of left lung

16. Alveoli
Alveolar duct
Respiratory
bronchioles
Alveolar duct
Terminal
bronchiole
Alveolar
sac

18. Type II (surfactant-secreting) cell Capillary endothelium
Red blood
cell
Capillary O2
Capillary
Type I cell
of alveolar wall
CO2
Alveolus
Macrophage
Alveolus
Alveolar
epithelium
Fused basement
membranes of the
alveolar epithelium
and the capillary
endothelium
Respiratory
membrane
Alveoli (gas-filled
air spaces)
Type II (surfactant-secreting) cell
Capillary
endothelium