• The sample of kidney on  shows many examples of simple epithelia, from very thin simple squamous to rather high cuboidal.
  • In the image to the right, we're looking at renal tubules lined with a single layer of simple cuboidal epithelium.
• The bright blue color in the Masson trichrome stain used here stains collagen and helps demonstrate the basement membranes of the epithelia.
  • What are the structural differences between the apical and the basal “sides” of cuboidal epithelial cells?

Now for simple columnar epithelium.