Development of
lungs and
diaphragm
Dr. Mohit Kumar
,Introduction
• Development of lung take place in 5 stages:
1. Embryonic stage (3-7wks)
2. Pseudoglandular (5-17 wks)
3. Canalicular stage(16-26wks)
4. Sacular(24-38wks)
5. Alveolar(36wks -18 month postnatal)
, EMBRYONIC STAGE
Formation of lung buds
• Starts when embryo is 4 weeks old
• Respiratory diverticulum (lung bud)appears as an outgrowth from
ventral wall of the foregut
lungs and
diaphragm
Dr. Mohit Kumar
,Introduction
• Development of lung take place in 5 stages:
1. Embryonic stage (3-7wks)
2. Pseudoglandular (5-17 wks)
3. Canalicular stage(16-26wks)
4. Sacular(24-38wks)
5. Alveolar(36wks -18 month postnatal)
, EMBRYONIC STAGE
Formation of lung buds
• Starts when embryo is 4 weeks old
• Respiratory diverticulum (lung bud)appears as an outgrowth from
ventral wall of the foregut