” the mesentery, an organ in which all digestive organs of the abdomen develop and then remain connected to.”
Now that’s something new. Never heard that before. It sounds like a vestigial organ like the appendix and the cocyx remnant of the vestigial tail.
I can’t see that it’s not synonymous with the peritoneum, which is big baggie or envelope with the abdominal organs inside. It holds them in place for one thing.