Resp embryology Flashcards
What are the 5 stages of lung development called?
Embryonic Pseudoglandular Canalicular Saccular Alveolar
When does the embryonic stage of lung development occur?
0-5 wks
When does the pseudoglandular stage of lung development occur?
5-16 wks
When does the canalicular stage of lung development occur?
16-26 wks
When does the saccular stage of lung development occur?
26 wks- birth
When does the alveolar stage of lung development occur?
Birth- 4 yrs
What develops during the embryonic stage of lung development?
Lung and trachea
What develops during the pseudoglandular stage of lung development?
Branched trachea, major structural units
What develops during the canalicular stage of lung development?
Respiratory bronchioles
What develops during the saccular stage of lung development?
Terminal sacs, type one and two cells
What develops during the alveolar stage of lung development?
Mature alveoli
What is the immature alveoli of the saccular stage like?
Simple with a thick interstitium
