5 Different stages of lower respiratory tract development

The lower respiratory tract development stages

Black Section Separator

Embryonic Stage

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Pseudoglandular Stage

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Canalicular Stage

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Saccular Stage

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Alveolar Stage

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Alveolar Stage

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The lower respiratory tract development stages

Embryonic Stage

The lung buds develop from the foregut's ventral wall, which subsequently gives rise to the trachea and bronchi.

Pseudoglandular Stage

During this stage, the epithelium, smooth muscles, and cartilage begin to form.

Canalicular Stage

The respiratory bronchioles and alveolar ducts begin to form during the canalicular stage, which occurs between 16 to 26 weeks

Saccular Stage

The first alveoli, known as saccules, form, and surfactant production begins.

Alveolar Stage

This stage begins shortly after birth and lasts until around the age of eight years.

Alveolar Stage

The saccules continue to grow in number and size as they mature into mature alveoli.

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