Human Bronchial Epithelial Cells

The trachea is composed of cartilage, muscle, connective tissue, and mucous membranes. Cartilage is a “C”-shaped cartilaginous ring with a notch posteriorly. Each cartilage ring is connected with a ligament. The gap behind the ring is connected by smooth muscle and dense connective tissue, and maintains a continuous open state. The bronchi refers to the branches divided by the trachea, the first bronchus separated by the trachea, namely the left and right main bronchus. The tracheal wall is divided into mucosa, submucosa and adventitia. The surface of mucosal is a pseudostratified ciliated columnar epithelium composed of cilia cells, goblet cells, basal cells, brush cells, and diffuse neuroendocrine cells.