Uberon definition : The lobar bronchus is the major airway within the respiratory tree that starts by
division of the principal bronchi on both sides and ends at the point of its own subdivision
into tertiary or segmental bronchi[GO].;
Uberon synonym : secondary bronchus;
Uberon related term : secondary bronchi; lobar bronchi;
Uberon Structure note : They have relatively large lumens that are lined by respiratory epithelium. There
is a smooth muscle layer below the epithelium arranged as two ribbons of muscle that
spiral in opposite directions. This smooth muscle layer contains seromucous glands.
Irregularly arranged plates of hyaline cartilage surround the smooth muscle. These
plates give structural support to the bronchus and maintain the patency of the lumen.;
The lobar bronchus is the major airway within the respiratory tree that starts by
division of the principal bronchi on both sides and ends at the point of its own subdivision
into tertiary or segmental bronchi[GO].