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  • Title: An ultrastructural study of pulmonary bronchiolar and alveolar epithelium in sheep.
    Author: Bouljihad M, Leipold HW.
    Journal: Zentralbl Veterinarmed A; 1994 Oct; 41(8):573-86. PubMed ID: 7732735.
    Abstract:
    The cellular population lining the bronchiolar and alveolar epithelium of the lower respiratory tract of three clinically healthy, purebred Suffolk lambs of both sexes and 3-4 months old was studied using a transmission-electron microscope. The epithelium of primary and secondary bronchioles consisted of four cell types: basal cells, intermediate cells, ciliated cells, and non-ciliated (Clara) cells, whereas the epithelium of terminal and respiratory bronchioles consisted of only two kind of cells: ciliated and Clara cells. The alveolar wall, including alveolar ducts and saccules, was covered by type I and type II pneumocytes. In addition, the presence of pulmonary intravascular macrophages was a constant in most of the alveolar capillaries. The morphologic characteristics of all these cells are described in detail and discussed.
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