Lung bronchus with existing bronchitis, cross-section
Cross-section of a lung bronchus of a lung that is suffering from bronchitis. From outside to inside, three wall layers are visible: Cartilagenous layer, mucular layer, and respiratory epithelium with microvilli. The bronchial mucosa is very inflamed (redness and swelling) and there is a purulent production of mucus (green secretion). In the background, the alveoles are visible.
