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That root extends down some distance and branches off into two large roots, which are the bronchial tubes. These two large roots veer off in different directions and become a network of small roots, or bronchioles, that cover a large area. The bronchial tubes are located at about the center of a personâs chest. They connect to an upper portion of the lungs, known as the hilum. The bronchial tube that branches to the right is shorter than the one that goes to the left. This is due to the positioning of the heart, which is on the left side of the chest.
It divides into two principle bronchi, tubes which conduct air into the lungs, and they divide into two lobar bronchi for the left lung, and into four lobar bronchi for the right lung. These further divide into smaller bronchi and bronchioles within the lung tissue. The structure of the larger bronchi is identical to that of the trachea. On the smaller bronchi the C-shaped cartilage rings are gradually replaced by irregular plaques of cartilage. Bronchioles have no cartilage at all. The bronchioles are less than 1mm in diameter, and undergo further divisions, the last of which is characterised by the loss of goblet cells.