Simple Squamous Epithelium


  1. Blood vessel
  2. Squamous cells forming the wall of an alveolus
  3. Same as 2, just a lower power magnification


  • Epithelial tissue is classified based on the shape of the cells at the apical surface and the number of layers of cells.
  • This tissue consists of 1 layer of cells that have a scale-like, flattened, or squished shape.
  • This tissue is very thin and thus fragile. It is only located in protected areas within the body.


  • It creates a thin barrier within the body which allows the passage of selected substances.
  • It will allow for absorption and secretion.
  • It also functions to filter fluids in the body.
  • Due to its single layer of cells, this thin tissue is not designed well for protection. One would need to add layers of cells (Stratified squamous epithelium) to increase its protective properties.
  • This tissue will also secrete lubricating substances to reduce friction as it lines body cavities like the pleural and abdominal


  • Renal corpuscles
  • Lung air sacs
  • Blood vessels
  • Lymphatic vessels
  • Serosae