bronchus
A large air-tube of the tetrapod lung. Each lung has one large bronchus, connecting it to the trachea. Within the lung the bronchus branches successively into five lobar bronchi, 20 segmental bronchi, two or three more divisions, and finally into bronchioles. A bronchus has cartilage plates, smooth muscle, and mucus-secreting gland-cells in its wall. It also has lining cells with cilia beating towards the mouth, which remove dust and other small debris.
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