THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The main bronchi divide into lobar or secondary bronchi within each lung. Two lobar bronchi exist in the left lung, and three exist in the right lung. The lobar bronchi, in turn give rise to segmental or tertiary bronchi. The tertiary bronchi supply the bronchopulmonary segments .

Detailed explanation-2: -Your trachea divides into your left and right bronchi. The bronchi carry air into your lungs. At the end of the bronchi, the bronchioles carry air to small sacs in your lungs called alveoli.

Detailed explanation-3: -Subsequent caudal and lateral bud growth forms the secondary bronchi, which expands into the body cavity. These secondary bronchi subdivide in a dichotomous fashion, thus forming eight tertiary bronchi in the left lung and ten tertiary bronchi in the right.

Detailed explanation-4: -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.