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Updated: Aug 13, 2026
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Angiogenesis in the Ischemic Rat Lung
Published on: February 8, 2013
Pulmonary arterial and alveolar development in normal postnatal rat lung
The American Review of Respiratory Disease
|April 1, 1982
Summary
Rat lung development involves rapid alveolar and arterial growth spurts post-birth. This lung development pattern highlights critical windows for potential injury during postnatal adaptation.
Area of Science:
- Pulmonary Medicine
- Developmental Biology
- Comparative Anatomy
Background:
- The postnatal lung undergoes significant structural and functional changes.
- Understanding lung development is crucial for identifying periods of vulnerability to injury.
Purpose of the Study:
- To investigate the quantitative changes in rat lung structure during postnatal development.
- To specifically examine the development of the pulmonary arterial circulation.
Main Methods:
- Quantitative light microscopy was employed.
- Rat lungs were analyzed at multiple time points from 12 hours to 36 days post-birth.
Main Results:
- Alveolar multiplication occurs rapidly between 3 and 8 days, followed by arterial multiplication between 8 and 11 days.
- Arterial structure within the acinus changes, with muscular arteries appearing in alveolar walls by 11 days.
- Medial thickness of intra-acinar arteries initially decreases then increases, and right ventricular weight decreases in early development.
Conclusions:
- Postnatal lung development is a dynamic process with distinct growth phases.
- The timing of lung development influences susceptibility to injury, with specific periods being more vulnerable.
- The nature of developmental disturbances is dependent on the timing of the insult.
