Respiratory System page 13

Contents

Yves Clermont, Michael Lalli, Zsuzsanna Bencsath-Makkai
LIGHT-MICROSCOPIC HISTOLOGY ATLAS

10. Respiratory System

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10.13 Terminal bronchiole

Version française

Section of a terminal bronchiole in the lung of a dog.

This field shows a longitudinal section of a terminal bronchiole (*) continuous with a respiratory bronchiole (RB) heading toward an alveolar duct (blue arrow at the top).

The terminal bronchiole shows folds of the mucosa lined with a ciliated epithelium (E). (The cilia are not evident at this magnification.)

This epithelium is next to a layer of smooth muscle fibres (M).

The respiratory bronchiole is lined with a simple epithelium of pale non-ciliated cells or Clara cells (Cl) sitting on a layer of smooth muscle fibres. The wall of the respiratory bronchiole is interrupted by passageways (arrowheads) opening into the lung alveoli (Al).

(Compare this image with the drawing in Figure 10.14.)

Stain: H–E
Magnification: ×175

The text and images of this Histology Atlas, by Yves Clermont, Michael Lalli & Zsuzsanna Bencsath-Makkai, are licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 Canada Licence and cannot be modified without the written permission of the authors. Use of any text or images must carry an acknowledgement which includes a link to the original work.