Uberon definition : The tertiary bronchi (also known as the segmental bronchi) arise from the secondary
bronchi. The respiratory epithelium lining their lumen is surrounded by a layer of
smooth muscle. This layer is composed of two ribbons of smooth muscle that spiral
in opposite directions. The smooth muscle layer is surrounded by irregular plates
of hyaline cartilage which help maintain the patency of the airway. Each of the tertiary
bronchi serves a specific bronchopulmonary segment. There are 10 tertiary bronchi
in the right lung, and eight in the left. The tertiary bronchi get smaller and divide
into primary bronchioles. [WP,unvetted].;
The tertiary bronchi (also known as the segmental bronchi) arise from the secondary
bronchi. The respiratory epithelium lining their lumen is surrounded by a layer of
smooth muscle. This layer is composed of two ribbons of smooth muscle that spiral
in opposite directions. The smooth muscle layer is surrounded by irregular plates
of hyaline cartilage which help maintain the patency of the airway. Each of the tertiary
bronchi serves a specific bronchopulmonary segment. There are 10 tertiary bronchi
in the right lung, and eight in the left. The tertiary bronchi get smaller and divide
into primary bronchioles. [WP,unvetted].