Lungs
Plate201
IntrapulmonaryAirways:Schema
Terminal
bronchiole
Bronchi
Bronchioles
Cartilages
become sparser
(mostly at
points of
branching)
Segmental
bronchus
Large
intrasegmental
bronchi
(about 5 generations)
Small intrasegmental bronchi
(about 15 generations)
Lobule
Terminal
bronchiole
Acinus
Subdivisions of intrapulmonary airways
Respiratory
bronchioles
(3–8 orders)
Alveolar
sacs and
alveoli
Opening of alveolar duct
Structure of intrapulmonary airways
Alveolar pores
(of Kohn)
Alveoli
Alveolar sac
Alveolar ducts
3rd order
2nd order
1st
order
Respiratory
bronchioles
(alveoli
appear
at this level )
Cartilages
Smooth muscle
Elastic fibers
Alveolus
Acinus
(part
of lung
supplied by
terminal
bronchiole)
No further
cartilages
