Definition
Developement stages
Embyonic (26 days-6 weeks): development of major airways
Pseudoglandular (6-16 weeks): development of airways to terminal bronchioles
Acinar or canalicular (16-28 weeks): development of acinus and its vascularization
Saccular (28-34 weeks): subduvision of saccules by secondary crests
Alveolar (34-39 weeks): alveolar acquisition
References
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