What is the small tubular structure located in the lower right quadrant of the abdomen called?

The small tubular structure located in the lower right quadrant of the abdomen is called the appendix. It is a small, finger-like projection that extends from the cecum, which is part of the large intestine. The appendix is considered to be part of the gastrointestinal tract and has traditionally been thought to play a role in the immune system and gut flora management, though its exact function is still a topic of research.

Understanding the location and function of the appendix is critical, especially in the context of medical emergencies such as appendicitis, which is inflammation of the appendix and can cause severe abdominal pain, typically in the right lower quadrant. Prompt recognition and treatment of appendicitis are vital to avoid complications such as rupture, which can lead to peritonitis—a serious and potentially life-threatening condition.

The other structures listed have distinct functions and locations: the colon is part of the large intestine surrounding the appendix, the spleen is located in the upper left quadrant and is involved in filtering blood, and the gallbladder is found under the liver and stores bile, an entirely different function centered around digestion.