A new human organ was discovered? Say hello to the mesentery, that is keeping your guts together

Mesentery – a previous thought to be insignificant attachment in our human abdomen is now been reclassified as a brand new organ!

So what is a mesentery?

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.

The mesentery which connects the intestine to the abdomen, had for hundreds of years been considered a fragmented structure made up of multiple separate parts. However, research by Professor of Surgery at UL’s Graduate Entry Medical School, J Calvin Coffey, found the mesentery is one, continuous structure.

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.

In a review published in the November issue of one of the top medical journals, The Lancet Gastroenterology & Hepatology, Professor Coffey outlined the evidence for categorising the mesentery as an organ.

“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,” Professor Coffey stated.

Better understanding and further scientific study of the mesentery could lead to less invasive surgeries, fewer complications, faster patient recovery and lower overall costs.

“When we approach it like every other organ…we can categorise abdominal disease in terms of this organ,” professor Coffey said.

According to Professor Coffey, the Foundation Chair of Surgery at UL’s Graduate Entry Medical School and University Hospitals Limerick, mesenteric science is its own specific field of medical study in the same way as gastroenterology, neurology and coloproctology.

“This is relevant universally as it affects all of us. Up to now there was no such field as mesenteric science. 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,” he said.

“During the initial research, we noticed in particular that the mesentery, which connects the gut to the body, was one continuous organ. Up to that it was regarded as fragmented, present here, absent elsewhere and a very complex structure. The anatomic description that had been laid down over 100 years of anatomy was incorrect. This organ is far from fragmented and complex. It is simply one continuous structure,” Professor Coffey explained.

The research has been published in The Lancet Gastroenterology & Hepatology.