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03-18-2009, 10:17 AM
Microanatomy of the lung:
- The large bronchi divide into smaller bronchi which divide into small bronchioles and then into respiratory bronchioles.
- The respiratory bronchioles may branch 3-5 times.
- Eventually the respiratory bronchioles form alveolar ducts then alveoeli.
The fundamental unit of the lung is the respiratory acinus which is the part of lung tissue formed by the branching of a single terminal bronchiole as above.

Source: Internal Medicine Book of Dr.Osama Mahmoud (Ain Shams University)