Figure 19­19
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In the lower part of the thorax, the trachea divides to form the two main bronchi that enter the lung. The histologic
Holdings,
features of the bronchi are similar to those of the trachea. The major exception is that the cartilaginous rings found
in the trachea are incomplete in the bronchi. The wall of the bronchus has several plates of hyaline cartilage. One of
these plates of cartilage can be seen in the lower right of the field (arrow).
LLC.
Not
The mucosal and submucosal tissues of the bronchi are similar to that in the trachea. Often, the mucosa and sub-
to
mucosa contain aggregations of lymphocytes forming the bronchus-associated lymphoid tissue, or BALT.
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