APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The tracheobronchial tree is composed of the trachea, the bronchi, and the bronchioles that transport air from the environment to the lungs for gas exchange.

Detailed explanation-2: -Segmental bronchi continue their branching until they reach the final, sixt generation of bronchi. Every generation, starting from primary, is supported by cartilage in its wall. After sixth generation, the passageways are too narrow to be supported by the cartillage, and thus are called bronchioles (small bronchi).