root of mesentery
the origin of the mesentery of the small intestine (jejunum and ileum) from the posterior parietal peritoneum; about 9 inches (23 cm) long, it extends from the duodenojejunal flexure (just to the left of the midline at the L2 vertebral level) to the ileocecal junction (right iliac fossa).
Synonym(s): radix mesenteriiTA
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Examples: glitazone, GI cocktail, etc.