Embryology ✅ Flashcards
Where does the respiratory tree arise from?
The ventral surface of the foregut
What are the phases of lung development?
- Embryonic phase
- Pseudoglandular phase
- Canalicular phase
- Saccular phase
- Term
When does the embryonic phase of lung development occur?
3-5 weeks
What happens in the embryonic phase of lung development?
The respiratory bud arises from the ventral surface of the foregut
What kind of mesoderm does the respiratory bud arise from?
Splanchnic
When does the pseudoglandular phase of lung development occur?
6-16 weeks
What is formed in the pseudoglandular phase?
Bronchial tree
What develops in parallel to the bronchial tree during the pseudoglandular phase?
The arterial supply to each lung
What is the result of the arterial supply of each lung arising parallel to the bronchial tree?
Arteries are found alongside each airway, a pattern that persists into adulthood
When do the pulmonary veins develop?
At a similar time to the arteries and bronchial tree
Do the pulmonary veins accompany the airways?
No
Where do the pulmonary veins lie?
In the intersegmental plane
When is smooth muscle present in the trachea and bronchi from?
10 weeks
When does cartilage develop in the respiratory system?
6 weeks
When are ciliated cells seen?
12 weeks onwards
