Figure 7-3. The larynx.
7-5. INFRALARYNGEAL STRUCTURES
a. Trachea and Bronchi. The respiratory tree (figure 7-4) is the set of tubular
structures which carry the air from the larynx to the alveoli of the lungs. Looking at a
person UPSIDE DOWN, the trachea is the trunk of the tree and the bronchi are the
branches. These tubular parts are held open (made patent) by rings of cartilage. Their
lining is ciliated to remove mucus and other materials that get into the passageway.