The secondary bronchi continue to branch off to form the tertiary bronchi, which are further divided into terminal bronchioles. There are as many as 30,000 tiny bronchioles in each lung.

A bronchus subdivides successively into bronchioles, air ducts (ductuli alveolares), air pockets (atria), lobules. Lobules bulge with many air sacs (acini) which look like clusters of grapes.

When you inhale, air moves down your trachea and then through two tubes called bronchi. The bronchi branch out into smaller tubes called bronchioles. At the ends of the bronchioles are little air ...

Methods for the study of cartilaginous airways represent technically very laborious and time-consuming procedures, many of these with the inevitable disruption or elimination of the distal bronchi ...