The Discovery of a New Organ
As of late 2016, a new human organ has been classified. It's been hiding in plain sight this whole time, too! The mesentery—which attaches your intestine to your abdomen—was once thought to be a series of fragmented structures, but research showed that it's actually one single organ.
New Field of Medical Science
Leonardo da Vinci depicted the mesentery as one continuous organ, but Sir Frederick Treves refuted this claim in 1885. It turns out that da Vinci had the right idea. Although the discovery of this organ doesn't alter the anatomy of the human body, the reclassification may help to establish new scientific functions and prevent more abdominal diseases.