Lung (Panoramic View)
The histology of Intrapulmonary bronchi is similar to that of the trachea and extra-pulmonary bronchiole, except that C-shaped cartilage rings are absent here and replaced by cartilage plates.
- Intrapulmonary Bronchus :
- Pseudo-stratified Columnar Ciliated Bronchial Epithelium
- Cartilage Plates & Seromucous Bronchial Glands
- Terminal Bronchiole :
- Simple Columnar Epithelium
- Prominent mucosal folds & well developed smooth muscles
- Respiratory Bronchiole :
- Simple Cuboidal Epithelium
- Alveolar Out-pocketings in the wall
- Gives rise to alveolar ducts
- Alveolar Walls :
- Out-pocketings of respiratory bronchioles
- type 1 & 2 Pneumocyets
- Also contain Alveolar macrophages
- Bands of Smooth muscle fibres in interalveolar septa
