part of part_of part of part_of contributes to morphology of composed primarily of cartilage of bronchus EMAPA:35192 FMA:62649 MA:0001835 NCIT:C49209 The hyaline cartilaginous structures that support the bronchi, present as irregular rings in the larger bronchi (and not as regular as in the trachea), and as small plates and islands in the smaller bronchi; as the branching continues through the bronchial tree, the amount of hyaline cartilage in the walls decreases until it is absent in the smallest bronchioles[MP]. UBERON:0001956 UMLS:C0225604 bronchi cartilage bronchial cartilage bronchial cartilage ring bronchial trunk cartilage bronchus cartilage cartilage of bronchi cartilage of bronchial trunk cartilagines bronchiales uberon hyaline cartilage tissue bronchus lower respiratory tract cartilage cartilage element