Embryology Flashcards
What is all other lung tissue (smooth muscle and cartilage etc.)?
Visceral mesoderm
Development of the bronchial tree: what is present at week 5?
Lung buds
Development of the bronchial tree: when is the left bronchus fullly formed?
Week 6
Development of the bronchial tree: when do the lungs begin to form lobes?
Week 8
Name two respiratory congenital defects
- Oesophageal atresia (blind ending)
2. Tracheaoesophageal fistula (communication)
During the embryonic stage, 26 days - 6 weeks, what events occur?
Respiratory diverticulum forms
Initial branching to give lungs, lobes and segements
During the pseudoglandular stage, 6 - 16 weeks, what events occur?
14 more generations of branching: terminal bronchioles
During the canalicular stage, 16 - 28 weeks, what events occur?
Terminal bronchioles to >2 respiratory bronchioles to 3 - 6 alveolar ducts
What happens during the saccular stage, 28 - 36 weeks?
Terminal sacs form; capillaries establish close contact
What occurs in the alveolar stage, 36 weeks to early childhood?
Alveoli mature
Alveolar development: what does cuboidal epithelium change to?
Thin squamous epithelium
Alveolar development: what do respiratory bronchiolus change to?
Terminal sacs
Alveolar development: What happens to blood capillaries?
Flat endothelium cell of blood capillary
What type of cells are blood-air barrier?
Type I cells
What type of cells produce surfactant?
Type II cells
