Note the vacuoles in the otherwise basophilic, abundant cytoplasm. Zoom out once. Also labeled are the smaller, rounded, rather undistinguished-looking lymphocytes. The middle circular structure is the bronchus. The bronchus is surrounded by a discontinuous layer of hyaline cartilage.
Cartilage is a type of connective tissue.
Surrounding the cartilage is a layer of dense connective tissue, the perichondrium . This lining is pseudostratified columnar, ciliated epithelium with goblet cells. A goblet cell and a ciliated epithelial cell are also labeled. This is an excellent view and it also contains mast cells and neutrophils within the lamina propria. Note the well preserved mucus-containing secretory vesicles in the goblet cell.