Pulmonary System Embryology 1 Flashcards

1
Q

What germ layer forms the epithelial lining of the respiratory tract?

A

Endoderm

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2
Q

What is the sulcus larngotrachealis?

A

A groove in the ventral lower pharynx that will develop into the lungs

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3
Q

What is the next step in lung development?

A

The true lung primordium buds from the lower portion

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4
Q

After the true lung primordium forms, what happens next?

A

it divides into 2 main bronchi and the endodermal branches into the lobes

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5
Q

When can the lung primordium first be observed?

A

Twenty-eight days

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6
Q

What epiglottis develops from what structure?

A

They hypopharyngeal eminence

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7
Q

What cell is the precursor of ciliated epithelium and secretory cells in the pulmonary system?

A

Cubic epithelium

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8
Q

A premature fetus born after 26 weeks has better survival odds thanks to what?

A

Capillaries have bulged into developing alveoli thus establishing a blood-air barrier and allowing for adequate gas exchange

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9
Q

At what point of development are the terminal saccules lined with type 1 alveolar cells?

A

By week 26

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10
Q

When do type II alveolar cells start producing surfactant?

A

By week 20 small amounts are produced, but adequate levels for survival are only produced around week 26 to 28

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