The structure you are describing sounds like the appendix. It is a small, tube-like structure that is attached to the cecum, which is the beginning of the large intestine. The appendix is often considered to be a vestigial organ, though it may have roles in gut flora and immune function. If you are referring to a different anatomical structure, please provide more context, and I'll be glad to help!
What is the skinny long short tube called, in the back, at the top, deeper down, below the stomach, inside the large intestines
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