This hardly coincides with the self-assuredness of the Darwinian pundits:
The mesentery: An organ?: Until recently, the prevailing view among scientists was that the mesentery, the large, fan-like sheet of tissue that holds our intestines in place, consisted of multiple fragments. In 2016, after examining the mesentery of both cadavers and patients undergoing surgery, a team of researchers concluded that the mesentery was actually a single unit. This wasn’t the first time the mesentery was described as continuous—in one of the first depictions of the structure, Leonardo da Vinci also portrayed it in this way. But in the 2016 paper, the scientists argued that its continuity should qualify the mesentery as an organ. As with the interstitium, however, other experts have objected to this claim. In both of these cases, “there seems to have been a misunderstanding of what the term organ means,” Neumann says.
Diana Kwon, “New Discoveries in Human Anatomy” at The Scientist
Sure, these are micro or distributed systems. But micro and distributed don’t mean unimportant. If we are still making new discoveries in human anatomy, many questions that we are told are settled are probably not settled. Many lecterns are splintered in vain. Much science education policy is Bad.
This account is a bit hypey but gives some sense of the story: