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Flashcards in Embryology Deck (10)
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1

Which germ layer gives rise to the lung bud and the lining of the respiratory tree?

Endoderm

2

Which germ layer gives rise to the smooth muscle, cartilage and blood supply of the respiratory tree?

Mesoderm

3

How do primary bronchial buds form?

Bifurcation of the trachea, producing the right and left bronchi

4

How do secondary bronchial buds form?

Bifurcation of right + left bronchi, producing 3 right lobar bronchi and 2 left lobar bronchi

5

Name the 5 stages of lung development (elephants play chess in sunny Africa...)

Embryonic
Pseudoglandular
Canalicular
Saccular
Alveolar

6

What happens in the embryonic phase of lung maturation?

Respiratory diverticulum forms off oesophagus
Initial branching produces lung, lobes + segments

7

What happens in the pseudoglandular phase of lung maturation?

Terminal bronchioles form

8

What happens in the canalicular phase of lung maturation?

Respiratory bronchioles form

9

What happens in the saccular phase of lung maturation?

Terminal sacs form (begin to form alveoli)

10

What happens in the alveolar phase of lung maturation?

Alveolar sacs mature