Story highlights

A study detailing the interstitium raises the idea of calling it an "organ"

Experts weigh in on this awe-inspiring space in our bodies

CNN  — 

To be or not to be an organ: That is the question.

Researchers have detailed the structure and distribution of spaces in your body that they say represent a newfound human organ, and this “organ” just might be your body’s biggest – but not all experts are convinced.

It’s the part of the body known as the interstitium, a name for widespread, fluid-filled spaces within and between tissues all over your body, according to a study published in the journal Scientific Reports on Tuesday.

Doctors and scientists have known about interstitial tissue and interstitial fluid, but the study provides fresh insights into a previously unrecognized feature of human anatomy – and the researchers are raising the idea of calling the interstitium an “organ.”