The wormlike sac that outpockets from the cecum is known as the appendix. The appendix is a small, tube-shaped structure that is located at the junction of the small intestine and large intestine, specifically at the beginning of the large intestine, or cecum.
Although its exact function is still debated, it is widely believed that the appendix plays a role in gut health. It may serve as a reservoir for beneficial bacteria, which can help repopulate the gut flora after illnesses that purge the intestines, such as diarrhea.
In some cases, the appendix can become inflamed, leading to a condition known as appendicitis. This condition often requires surgical removal of the appendix to prevent complications. Despite the removal of the appendix, most people live healthy lives without it, further indicating that while it has potential functions, it is not essential for survival.