What are bronchioles?

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It is called the bronchioles. Gray's Anatomy (1918) describes it as the smallest air-conducting tubes of the lung.

Summary

It is called the bronchioles. Gray's Anatomy (1918) describes it as the smallest air-conducting tubes of the lung.

What it is

  • The smallest air-conducting tubes of the lung.
  • Less than 1 mm across.
  • Their walls contain smooth muscle but no cartilage.

Where it is

  • Inside the lungs, beyond the smallest bronchi.
  • End in the terminal bronchioles, which lead to the alveoli.
  • Distributed throughout every part of the lung.

Sources

According to Gray's Anatomy of the Human Body (1918, public domain):

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