part of part of epithelium of bronchus bronchus basement membrane of epithelium bronchus basement membrane UMLS:C1707051 bronchial basement membrane MA classifies as type of connective tissue: https://github.com/obophenotype/mouse-anatomy-ontology/issues/108 NCIT:C49208 UBERON:0009652 uberon EMAPA:37809 MA:0001832 A basement membrane that is part of a bronchus. respiratory system basement membrane