Microscopic anatomy of the ringed seal (Phoca hispida) lower respiratory tract |
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Authors: | Smodlaka H Reed R B Henry R W |
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Affiliation: | Department of Comparative Medicine, The University of Tennessee, 2407 River Drive, Room A205 Knoxville, TN 37996-4543, USA. |
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Abstract: | The microscopic anatomy of the ringed seal lung exhibits unique features and many features similar to those described in other seal species. Unique features include: Trachealis muscle predominately oriented longitudinally; Large veins within the tracheal wall supported by elastic fibers; Goblet cells and pseudostratified epithelium lining the duct system of bronchial glands of the segmental bronchi; Lamina propria of the segmental bronchus heavily invested with elastic fibers clustered into dense longitudinal bundles; and Capillaries and venules covered with squamous epithelium protruding into bronchiolar lumina. Common features include: Cartilage support of the bronchial tree extending distally into respiratory bronchioles; Smooth muscle enhancements in the distal airways producing sphincter like formations; and Lungs extensively supported with interstitial tissue, which divide lungs into lobules. |
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