Embryology COPY Flashcards

1
Q

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

A

Endoderm

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2
Q

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

A

Mesoderm

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3
Q

How do primary bronchial buds form?

A

Bifurcation of the trachea, producing the right and left bronchi

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4
Q

How do secondary bronchial buds form?

A

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

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5
Q

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

A
Embryonic
Pseudoglandular
Canalicular
Saccular
Alveolar
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6
Q

What happens in the embryonic phase of lung maturation?

A

Respiratory diverticulum forms off oesophagus

Initial branching produces lung, lobes + segments

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7
Q

What happens in the pseudoglandular phase of lung maturation?

A

Terminal bronchioles form

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8
Q

What happens in the canalicular phase of lung maturation?

A

Respiratory bronchioles form

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9
Q

What happens in the saccular phase of lung maturation?

A

Terminal sacs form (begin to form alveoli)

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10
Q

What happens in the alveolar phase of lung maturation?

A

Alveolar sacs mature

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