Single-Layered Squamous Epithelium-Peritoneum-Serosa

The peritoneum, the serosa of the peritoneal cavity, consists of a layer of peritoneal single-layered (simple) squamous epithelium and a sub epithelial layer of collagenous connective tissue—i.e., the lamina propria serosae . The free surface of the flat epithelium (mesothelium, serosa lining) is covered with microvilli.

The cells of the peritoneal epithelium are flat, polygonal cells with serrated cell borders that can be accentuated by silver impregnation.  The cell borders in the figure are clearly defined and look like short bars. The   nuclei have the shape of lentils. Raised plasmalemma domes indicate their location. The surface above the nuclei has fewer microvilli.

Scanning electron microscopy; magnification: × 1650

References

Kuehnel, W.(2003). Color Atlas of Cytology, Histology, and Microscopic Anatomy. 4^th edition . Institute of Anatomy Universitätzu Luebeck Luebeck, Germany . Thieme Stuttgar t · New York .