Tracheal wall - l.s. Trachealis muscle Adventitia Cartilage rings Submucosa Mucosa Lumen of trachea Lumen of trachea

Tracheal wall - c.s. Trachealis muscle Ends of C-shaped cartilage ring Lumen Mucosa Submucosa C-shaped cartilage ring Adventitia

Tracheal wall layers Seromucus glands in submucosa Adventitia Trachealis muscle C-shaped cartilage ring Submucosa Submucosa Mucosa Mucosa Lamina propria Ciliated pseudostratified columnar epithelium with goblet cells

Bronchus histology Cartilage dics Alveoli Smooth muscle layer below mucosa Ciliated pseudostratified epithelium with goblet cells Alveoli Cartilage dics Smooth muscle layer below mucosa Ciliated pseudostratified epithelium with goblet cells Cartilage dics Ciliated pseudostratified epithelium with goblet cells Lumen of bronchus Lumen of bronchus

Bronchiole histology Alveoli Smooth muscle layer Simple cuboidal epithelium Lumen of bronchiole Alveoli Smooth muscle layer Simple cuboidal epithelium Lumen of bronchiole Blood vessel associated with bronchiole

Alveoli histology Dust cells with carbon deposit Branches of pulmonary arteries Alveolus Type I alveolar cells Dust cells/macrophages Alveolus Septum dividing lungs into lobules Visceral pleura around the lung