Plate 11.226 Bronchiole
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed
Cat, 10% formalin, H. & E., 162 x.
This is a cross section of a bronchiole surrounded by respiratory tissue. Note the low columnar epithelial lining, the prominence of smooth muscle fibers in the lamina propria, and the absence of cartilaginous plates and glands. Macrophages filled with black carbon particles are seen in the lumen of the bronchiole. The elastic spongework of respiratory tissue surrounding the bronchioles prevents their collapse during inspiration. Every inspiratory movement exerts a pull on the wall of the bronchiole protecting it from collapse, hence there is no need for cartilage rings or plates.
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