mesenterion

Mesenterion is a historical or comparative anatomy term that refers to a mesenteric element associated with the digestive tract. In broad usage, it has been employed to denote structures related to the mesentery or to the midgut itself, but it is not a standard term in contemporary human anatomy. The word derives from Greek roots meaning “in the middle” and “intestine.”

In modern human anatomy, the preferred terms are mesentery or mesenterium, which describe the peritoneal folds that suspend the intestines from the posterior abdominal wall and contain vessels, nerves, and lymphatics. The term mesenterion, by contrast, may appear in historical texts or in certain comparative or taxonomic works to indicate a mesenteric element or a midgut structure in particular species. Its exact reference can be context-dependent and sometimes ambiguous.

In comparative and embryological contexts, mesenterion has been used to discuss mesenterial folds or partitions within the coelomic cavity, as well as the development and arrangement of dorsal or ventral mesenteries that support the gut tube. The concept emphasizes the role of mesenteric tissues in gut positioning, movement, and the conduit for vascular and neural supply.

Overall, mesenterion is a historical or nonstandard term. When encountered, it is best interpreted in light of the surrounding anatomical or taxonomic context, with modern terminology—mesentery or mesenterium—providing the primary framework.

See also: mesentery, mesenterium, mesenterial.