Appendix. Coloured scanning electron micrograph (SEM) of the wall of the human appendix showing large numbers micro- villi covered absorptive cells. Mucous secretion from goblet cells is also occasionally present. Debris in the appendix lumen is seen at the top of the image. The appendix is a finger-shaped pouch that projects from the colon on the lower right side of the abdomen. Appendicitis is an inflammation of the appendix. Although anyone can develop appendicitis, it occurs most often in people between the ages of 10 and 30. Standard treatment is surgical removal of the appendix. Magnification: x2400 when printed 10 centimetres wide