#mesentery

it's the thick ribbon of tissue that connects your intestines to the rest of your abdominal cavity, keeping the majority of its blood vessels and nerves and such

it's a very fatty bit of tissue, so you get a delicious bit of contrast between its bloody golden orange and the visceral red-purple of the intestines themselves

We thought we knew the human body — but a new organ has been officially discovered.

In a groundbreaking discovery, researchers have officially classified the mesentery—a structure in the digestive system—as a distinct human organ.

Previously thought to be a fragmented and insignificant part of the abdominal cavity, new research reveals that the mesentery is actually a continuous structure that plays a crucial role in holding the intestines in place.

This reclassification, led by J Calvin Coffey from the University Hospital Limerick in Ireland, has been recognized in medical textbooks like Gray’s Anatomy and is now being taught to medical students. While its precise function remains unclear, studying this newly recognized organ could lead to breakthroughs in understanding and treating abdominal and digestive diseases.

The mesentery’s discovery marks the beginning of a new medical field—mesenteric science—which aims to uncover its role in human health. Researchers believe that a deeper understanding of it will help identify diseases linked to abnormal mesenteric activity. This revelation reminds us that, despite advances in science, there is still much to learn about our own bodies. With further research, the mesentery could hold key insights into improving gastrointestinal health and developing innovative treatments for abdominal disorders.

Mesentery is now classified as an organ.

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.

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. "In the paper, which has been peer reviewed and assessed, we are now saying we have an organ in the body which hasn’t been acknowledged as such to date," said J Calvin Coffey, a researcher from the University Hospital Limerick in Ireland, who first discovered that the mesentery was an organ.

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.

But in 2012, Coffey and his colleagues showed through detailed microscopic examinations that the mesentery is actually a continuous structure. And while that doesn't change the structure that's been inside our bodies all along, with the reclassification comes a whole new field of medical science that could improve our health outcomes.

"When we approach it like every other organ… we can categorise abdominal disease in terms of this organ," said Coffey. "Now we have established anatomy and the structure. The next step is the function. If you understand the function you can identify abnormal function, and then you have disease. Put them all together and you have the field of mesenteric science … the basis for a whole new area of science.”

"This is relevant universally as it affects all of us."

A mighty membrane that twists and turns through the gut is starting the new year with a new classification: the structure, called the mesentery, has been upgraded to an organ.