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Normal·Respiratory·Lung

Lung — alveolar parenchyma

Stain: H&E·Magnification: 40x·Tissue: Alveolar·4 labeled regions
Lung — alveolar parenchyma histology — Respiratory, Lung, H&E
Wikimedia Commons · File:Alveolar sac.JPG · https://commons.wikimedia.org/wiki/File:Alveolar_sac.JPG (CC-licensed)
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Description

Open spaces lined by Type I pneumocytes (thin, gas exchange) and Type II (cuboidal, surfactant). Macrophages roam the airspaces.

Labeled regions (4)

  1. 1
    Alveolar space

    Air-filled lumen.

  2. 2
    Type I pneumocyte

    Flat squamous cell covering ~97% of alveolar surface.

  3. 3
    Type II pneumocyte

    Cuboidal; surfactant + progenitor for type I.

  4. 4
    Alveolar macrophage

    Dust cell; can become 'heart failure cells' (hemosiderin-laden) in chronic LHF.

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