In human anatomy, the appendix (or vermiform appendix; also cecal (or caecal) appendix; also vermix) is a blind-ended tube connected to the cecum (or caecum), from which it develops embryologically. The cecum is a pouchlike structure of the colon. The appendix is located near the junction of the small intestine and the large intestine.
The appendix averages 10 cm in length, but can range from 2 to 20 cm.
The most common explanation for the appendix's existence in humans is that it's a vestigial structure which has lost its original function.New studies propose that the appendix may harbor and protect bacteria that are beneficial in the function of the human colon.
The most common diseases of the appendix (in humans) are appendicitis and carcinoid tumors (appendiceal carcinoid). Appendix cancer accounts for about 1 in 200 of all gastrointestinal malignancies. In rare cases, adenomas are also present.