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Bronchiole Wall Anatomy

image descriptionAn enlarged cross-sectional view of a bronchiole reveals the tissue layers that make up the wall.

 

Anterior view of lungs and cross section of bronchiole wall
A zoomed in perspective of the bronchiole wall
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  •  image descriptionCiliated simple columnar cells form the epithelial lining in the large bronchioles. In the small bronchioles, the epithelium changes to simple cuboid cells. Goblet cells and seromucous glands become less numerous with each bronchiole division.
A zoomed in bronchiole wall section
Ciliated simple columnar cells labeled on a zoomed-in image of bronchiole wall
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  • A ring of image descriptionsmooth muscle fibers surrounds the epithelium. During exhalation, these muscle fibers contract to help force air out of the bronchioles. The resulting compression causes the epithelium to image descriptionfold.
A zoomed in bronchiole wall section
Smooth muscle labeled on a zoomed-in image of bronchiole wall
A zoomed in bronchiole wall section
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  • The thin-walled brochioles are attached to the surrounding elastic image descriptionalveoli. This connection keeps the bronchioles from collapsing during breathing move-ments. Because they are not needed for support, cartilage plates are characteristically absent.
A zoomed in bronchiole wall section
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  • The following photomicrograph shows a more realistic depiction of the layers and structures that make up the tracheal wall. [ image descriptionEpithelial foldsimage descriptionsmooth muscle
Bronchiole Wall Micrograph
Bronchiole Wall Micrograph labeled epithelial fold
Bronchiole Wall Micrograph labeled smooth muscle
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An Overview of the Bronchiole Wall:

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Test Yourself on the Bronchiole Wall with answers shown
Test yourself while observing the bronchiole wall anatomy
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