Mucous membrane of trachea; Tracheal mucous membrane; mucosa of organ of trachea; mucosa of organ of windpipe; mucosa of trachea; mucosa of windpipe; mucous membrane of windpipe; organ mucosa of trachea; organ mucosa of windpipe; trachea mucosa; trachea mucous membrane; trachea organ mucosa; tunica mucosa tracheae; windpipe mucosa; windpipe mucous membrane; windpipe organ mucosa