Histology of Respiratory and Digestive Systems

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Histology of Respiratory and Digestive Systems
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Histology of the Respiratory System
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Trachea Tissue
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Trachea
Note hyaline cartilage (C-ring though you cant
see the whole shape) and the pseudostratified
ciliated columnar epithelium.
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Bronchus Note that you are within the lung and
that this tube is surrounded by plates of
hyaline cartilage
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Lung and Bronchiole Tissue
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Bronchiole

• In the center of the image is a thick walled
  bronchiole
• Note the thick muscularis mucosa
• Note the lack of cartilaginous plates which
  distinguish bronchioles from bronchi.

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Lung alveoli lined with simple squamous
epithelium
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Digestive System Histology
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Histology of the Esophagus
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Esophagus
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Small Intestine Histology
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Small Intestine Histology
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• The large intestine is identified by
• Numerous goblet cells
• Deep crypts with no villi
• Numerous lymphocytes due to the normal flora
  present in the lumen

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Pancreas Histology
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Pancreas Acini and Islets

• The difference between the Exocrine Endocrine
  pancreas
• Red arrow ? Islets of Langerhans
• Yellow dotted lines ? Secretory Acini
• White arrows ?secretory acini of the pancreas
  which have a characteristic cell type called
  Central Acinar Cells

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Liver lobules lower magnification
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Liver Histology portal triad

The portal triad consists of the portal vein,
branches of the hepatic artery (red), and
tributaries to the bile duct (green)