You’ve been walking around with an unknown organ without even realizing it. The mesentery, which connects the abdomen and intestine, isn’t exactly a new find, but doctors previously thought it was fragmented, instead of continuous. Now University of Limerick scientists are seeking to reverse the centuries-old viewpoint in an article explaining why this piece of the body deserves to be classified as an organ.

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For more than 100 years, scientists thought the mesentery was comprised of several different, complex segments. Not so, say J. Calvin Coffey and D. Peter O’Leary. They found the mesentery was in fact “one continuous structure,” according to Coffey, and worthy of classification as an organ. The mesentery serves to help organs like the colon and small intestine maintain their shape, wrapping around them in one ribbon of tissue. Coffey told Discover Magazine, “Without it you can’t live. There are no reported instances of a Homo sapien living without a mesentery.” He and his team established the continuous structure of the mesentery back in 2012, and have been building up evidence since then.

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A better understanding of the mesentery could help doctors as they operate on the body, even resulting in less invasive surgeries and complications, according to the University of Limerick. Patients could recover faster and pay less if the medical community had further knowledge of the mesentery. Coffey said in a statement, “When we approach it like every other organ…we can categorize abdominal disease in terms of this organ.”

So who gives the final word on whether the mesentery is officially an organ? Coffey told Discover Magazine he doesn’t actually know. For now his article can be read in the journal The Lancet Gastroenterology & Hepatology, who published the research in late 2016.

Via Discover Magazine and University of Limerick

Images via Alan Place and J. Calvin Coffey/D. Peter O’Leary/Henry Vandyke Carter