The Mesentery or the human organ you never heard of
It's official: A brand-new human organ has been classified
Researchers have classified a brand-new organ inside our bodies, one that's been hiding in plain sight in our digestive system this whole time. Although we now know about the structure of this new organ, its function is still poorly understood, and studying it could be the key to better understanding and treatment of abdominal and digestive disease.
Posted by Jill Fallon at January 4, 2017 10:41 AM
Known as the mesentery, the new organ is found in our digestive systems, and was long thought to be made up of fragmented, separate structures. But recent research has shown that it's actually one, continuous organ. The evidence for the organ's reclassification is now published in The Lancet Gastroenterology & Hepatology.
So what is the mesentery? It's a double fold of peritoneum — the lining of the abdominal cavity — that attaches our intestine to the wall of our abdomen, and keeps everything locked in place.
One of the earliest descriptions of the mesentery was made by Leonardo da Vinci, and for centuries it was generally ignored as a type of insignificant attachment. Over the past century, doctors who studied the mesentery assumed it was a fragmented structure made of separate sections, which made it pretty unimportant.