Plate 11.227 Lung
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Cat, 10% formalin, H. & E., 50 x.
Refer to Figure 11A which can be used in conjunction with this plate in order to follow the structural changes that occur from the respiratory bronchiole to alveolar ducts to alveolar sacs where gaseous exchange takes place.
Respiratory bronchioles: A branch of the terminal bronchiole. Alveoli arise as outpouchings of the bronchiole. Pulmonary arteries and veins are found adjacent to the bronchiole, but only capillaries extend beyond the respiratory bronchiole.
Alveolar ducts: Arise by branching of respiratory bronchioles; walls made up of alveolar sacs and alveoli.
Alveolar sacs: Cluster of alveoli that open into the lumen of the alveolar ducts. Composed of squamous epithelial cells, basement membrane, and capillaries. Site of respiratory exchange.
Visceral pleura: A serous membrane that intimately covers the surface of the lung.
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