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  • a narrow, worm-like diverticulum arising from the caecum, inferior to the ileocaecal valve
  • Its length ranges from about 5-15 cms and it is completely covered by peritoneum
  • possesses a short mesentery, the mesoappendix
  • Although the origin of the appendix is relatively constant, the position of its body is variable
  • Most commonly, it is retrocaecal but it might also be found extending down into the pelvis, or in front of or behind the ileum
  • The muscosa of the appendix is particularly rich in lymphoid tissue and it is susceptible to infection
  • McBurney's point is an important surface landmark for the appendix
    • It is at the junction of the lateral 1/3 and the medial 2/3 of a line joining the right anterior superior iliac spine to the umbilicus.