Light micrograph of mesothelial cells lining the outer surface of a fallopian tube. Mesothelial cells are the cells lining some inner body cavities in the chest, abdomen, and pelvis. The mesothelial cells form a continuous thin blue wavy line on top of pink fibrous tissue and blood vessels. Haematoxylin and eosin stained tissue section. Magnification: 100x when printed at 10cm.