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Histology of a BRONCHIOLE:

Histology of a BRONCHIOLE: When diameter of the tube reaches about 1mm, the cartilage disappears from the wall and structure is known as bronchiole.

The epithelium is pseudostratlfled dilated and contain very few goblet cells which are completely absent beyond terminal bronchiole. The epithelium is folded. The smooth muscle Is disposed in spiral manner like bronchi; being the most prominent feature of bronchiole.

The terminal bronchioles are lined with simple columnar or cuboldal epithelium. Few Clara cells are also seen.

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