What is the Vermiform Appendix?

Mary McMahon
Mary McMahon
A koala's vermiform appendix allows it to digest eucalyptus leaves.
A koala's vermiform appendix allows it to digest eucalyptus leaves.

The vermiform appendix, also known simply as the appendix, is an organ in the human body which appears to be vestigial, meaning that it is a remnant of an earlier stage in human evolution, although some doctors have suggested that this organ may actually have a function. Some people are familiar with the vermiform appendix in the form of an organ which becomes infected, causing death if it is not removed in an appendectomy procedure. At one time, surgeons routinely took the appendix out during surgeries for other issues, under the assumption that it could become infected in the future, but this practice is no longer common.

The appendix often must be surgically removed when it becomes inflamed and infected.
The appendix often must be surgically removed when it becomes inflamed and infected.

This organ protrudes from the cecum, a pouched area of the colon located on the right side of the body. Normally, the appendix is found in the lower right abdomen. When it becomes infected, it creates a characteristic dull pain, with appendicitis usually being diagnosed when a doctor palpates the lower abdomen. The “vermiform” is a reference to the fact that the appendix resembles a little worm dangling from the cecum.

The vermiform appendix is believed to be active during fetal development.
The vermiform appendix is believed to be active during fetal development.

In addition to becoming infected, the appendix can also sometimes become cancerous. Removal of the appendix appears to have no ill affect on patients, leading doctors to surmise that this organ has no function. Some people have suggested that the vermiform appendix may have once been larger, and used to help humans digest leaves and other roughage. This theory is supported by the presence of similar organs in animals like koalas, who eat a great deal of roughage routinely.

Removal of the appendix seems to have no effect on patients.
Removal of the appendix seems to have no effect on patients.

Inspections of the appendix have revealed that it is unusually high in lymph cells. This discovery has led some doctors to suggest that the vermiform appendix may actually play a role in the immune system. It may serve as a reservoir for immune cells, boosting the immune system when the body is having difficulty fighting off disease and infection. The fact that people don't seem to suffer without an appendix makes it difficult to prove this theory.

Appendicitis may be characterized by a dull pain in the lower abdominal region.
Appendicitis may be characterized by a dull pain in the lower abdominal region.

Doctors can also use the vermiform appendix in reconstructions of other organs, such as the bladder. This is why the appendix is now left in unless it becomes infected, under the argument that it could be useful as a “spare part” in the event that its host develops a medical problem.

While the vermiform appendix is famous, it is far from the only vestigial body part. Humans have a structure in their skulls called the vomeronasal organ or Jacobson's organ which appears to have no current function, although this organ is used in numerous other mammals. Intriguingly, both the vermiform appendix and vomeronasal organ appear to be active during fetal development, suggesting that these organs may be performing some sort of function while humans are in the womb. Some adolescents also develop wisdom teeth, also known as mandibular third molars, another legacy of earlier humans.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a InfoBloom researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a InfoBloom researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

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Discussion Comments

powerpost45

Pain in the appendix due to appendicitis may start out as a general feeling of pain across the abdomen. Some people think they are just constipated at first, however the pain will continue to increase over time. Once the appendix ruptures the pain is usually more localized to the right lower side of the abdomen near the pelvic region. If you have appendicitis it will usually begin to hurt so much that it may be hard to stand up and if there is an infection you will probably have a fever. One of the classic symptoms of appendicitis is rebound tenderness. The physician will press down hard on the right abdomen and you will feel more pain after the doctor removes the pressure.

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    • A koala's vermiform appendix allows it to digest eucalyptus leaves.
      By: Friedberg
      A koala's vermiform appendix allows it to digest eucalyptus leaves.
    • The appendix often must be surgically removed when it becomes inflamed and infected.
      By: p6m5
      The appendix often must be surgically removed when it becomes inflamed and infected.
    • The vermiform appendix is believed to be active during fetal development.
      By: hartphotography
      The vermiform appendix is believed to be active during fetal development.
    • Removal of the appendix seems to have no effect on patients.
      By: Monkey Business
      Removal of the appendix seems to have no effect on patients.
    • Appendicitis may be characterized by a dull pain in the lower abdominal region.
      By: Photographee.eu
      Appendicitis may be characterized by a dull pain in the lower abdominal region.
    • Once an appendix becomes inflamed in a person it must be removed immediately.
      By: kistya
      Once an appendix becomes inflamed in a person it must be removed immediately.
    • The appendix protrudes from the cecum, a pouched area of the colon located in the lower right abdomen.
      By: graphicgeoff
      The appendix protrudes from the cecum, a pouched area of the colon located in the lower right abdomen.
    • Like the appendix, teenagers often develop wisdom teeth that serve no purpose and must be removed.
      By: luanateutzi
      Like the appendix, teenagers often develop wisdom teeth that serve no purpose and must be removed.
    • An infection of the appendix may cause pain on the lower right side of the abdomen.
      By: staras
      An infection of the appendix may cause pain on the lower right side of the abdomen.