Embryology Flashcards
1
Q
When is the embryonic stage?
A
26 days - 6 weeks
2
Q
What occurs during the embryonic stage?
A
Respiratory diversticulum forms
Initial branching to give lungs, lobes and segments
3
Q
When is the pseudoglandular stage?
A
6-16 week
4
Q
What occurs during the pseudoglandular stage?
A
14 more generations of branching: terminal bronchioles
5
Q
When is the canalicular stage?
A
16-28 weeks
6
Q
What occurs during the canalicular stage?
A
Terminal bronchioles develop into 2 respiratory bronchioles which develops into 3-6 alveolar ducts
7
Q
When is the saccular stage?
A
28-36 weeks
8
Q
What occurs during the saccular stage?
A
Terminal sacs form, capillaries establish close contact
9
Q
When is the alveolar stage?
A
36 weeks - early childhood
10
Q
What occurs during the alveolar stage?
A
Alveoli mature
