part_of part of part of has part has part has_part organ lower respiratory tract bronchus trachea tracheobronchial tree UBERON:0007196 NCIT:C117875 tracheobronchial system The structure from the trachea, bronchi, and bronchioles that forms the airways that supply air to the lungs. The lining of the tracheobronchial tree consists of ciliated columnar epithelial cells. SCTID:361384001 FMA:7393 Wikipedia:Tracheobronchial_tree ciliated columnar epithelium