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CHAPTER 2 - EPITHELIUM
Histology Guide
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MICROGRAPH

NAME
EM 072 Mesothelium
TISSUE
Mesothelium
(visceral peritoneum)
IMAGE SIZE
8,545 x 5,461 pixels
178 MB
FILE SIZES
31,014 KB (grayscale)
31,092 KB (color)
MAGNIFICATION
Unknown
PIXEL SIZE
1.709 nm
SOURCE
Stanley L. Erlandsen
Department of Genetics, Cell Biology and Development
School of Medicine
University of Minnesota
Minneapolis, MN

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EM 072 Mesothelium

Simple Squamous Epithelium

The mesothelium is a simple squamous epithelium that lines several body cavities (pleura around the lungs, pericardium around the heart, peritoneum in the abdominal cavity, and tunica vaginalis that covers the testes).

This micrograph shows a cross-section of the mesothelium that covers the peritoneum.

  • (dark green)
  • (blue) - bulge from the flattened cells
    • Nuclear Envelope (purple)
  • (red)
  • (cyan) - ribosomes (black dots) are found on its surface
  • Cytoplasm (green) - clusters of ribosomes (black dots) are found in many regions

The mesothelium rests on the basal lamina supported by a thin layer of connective tissue.

  • (dark purple) - contains a network of reticular collagen IV fibrils. It appears as a dark line that separates the epithelium from the underlying connective tissue.
  • (grayscale) - collagen fibers are seen in both cross-sections and longitudinal sections.

Tight Junctions

Tight junctions (also known as zonula occludens) are areas where the plasma membranes of adjacent cells come very close together.

A small portion of another cell can be seen at the top of this image. The appear as darker material along the plasma membranes of the two cells.

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