6-7 cm residuum of the cecum partially anchored by a mesenteric extension of the ileum.
No known function.
Considered to be a vestigial organ.
Possesses same four layers of the gut and has a colonic mucosa.
Flora in the appendix is similar to that in the colon, with a facultative aerobic and anaerobic bacteria.
The most frequent organisms found in the appendix are E. Coli, Streptococcus viridians, Bacteroides and Pseudomonas species, but many other organisms may be present.
Has a rich lymphoid make up, which undergoes atrophy to the point of disappearance at advanced age.
Undergoes fibrous obliteration.
Its importance lies in its susceptibility for inflammation causing abdominal pain, organ swelling and the clinical syndrome of acute appendicitis.