Human superior bronchus tissue samples are specimens from the upper main branches of the trachea that lead to the lungs. These samples are valuable for studying the anatomy, physiology, and pathology of the larger airways. They provide a source of bronchial epithelial cells, smooth muscle, and connective tissue, which are essential for understanding diseases affecting the bronchi, such as bronchitis, asthma, and COPD. Researchers use these tissues to investigate inflammation, remodeling, and the effects of various stimuli or therapeutic agents on bronchial function. Samples can be provided as sections from fixed tissue in paraffin blocks or OCT, or as snapfrosts of fresh tissues.