On entering the lungs, the primary bronchi divide to form smaller bronchi called lobar.
The secondary lobar bronchi or just lobar bronchi are the primary subdivision of the main (or number one) bronchi. Like the number one and tertiary bronchi, they're undertaking airways that are covered by way of cartilage. The left foremost bronchus offers rise to two secondary bronchi: the left upper lobe bronchus.
The right important bronchus subdivides into three lobar bronchi, even as the left important bronchus divides into two. The lobar bronchi (additionally referred to as secondary bronchi) divide into tertiary bronchi, each of which supplies air to a one-of-a-kind bronchopulmonary segment.
The segmental bronchi divide into many smaller bronchioles that divide into terminal bronchioles, after which into respiration bronchioles, which divide into 2 to 11 alveolar ducts.
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