Embryology Flashcards
1
Q
At what week does the respiratory system start to form?
A
- week 4
2
Q
Where does the lung bud form from?
A
- foregut region
- outpouching of the primitive digestive tract (oesophagus)
3
Q
What are the 5 stages of lung development?
A
- Embryonic
- Psuedoglandular
- Canalicular
- Saccular
- Alveolar
4
Q
Explain the embryonic phase of lung development?
A
- respiratory diverticulum starts to form
- 26days-6 weeks
5
Q
Explain the psuedoglandular phase of lung development?
A
- more branching
- terminal bronchioles
- 6-16 weeks
6
Q
Explain the canalicular phase of lung development?
A
- respiratory bronchioles form and alveolar ducts
- 16-28 weeks
7
Q
Explain the saccular phase of lung development?
A
- terminal sacs form
- 28-36weeks
8
Q
Explain the alveolar phase of lung development/
A
- alveolar mature
- 36weeks to childhood
9
Q
What does the type II alveolar cells do?
A
- secrete surfactant
10
Q
What respiratory structures are formed of the endoderm
A
- lining of the trachea and bronchial tree
11
Q
What respiratory structures are formed of the visceral mesoderm?
A
- all other structures other than the lining of the tracea and bronchial tree
