Root of the mesentery

Dr Craig Hacking and Dr Yair Glick et al.

The root of the mesentery, or root of the small bowel mesentery to be exact, is the origin of the mesentery of the small intestine (i.e. jejunum and ileum) from the posterior parietal peritoneum., attached to the posterior abdominal wall. It extends from the duodenojejunal flexure to the ileocecal junction in the right iliac fossa.

Gross anatomy

The mesenteric root lies along a line running diagonally from the duodenojejunal flexure to the right sacroiliac joint. It crosses over the third part of the duodenum, aorta, inferior vena cava, right ureter and right psoas major muscle. Its average length is 15 cm, while the intestinal attachment of the mesentery is the same length as the small intestine itself (around 3.5-5 m) and greatly folded.

It contains the superior mesenteric artery (SMA) and superior mesenteric vein (SMV).


The mesenteric root is contiguous


Anatomy: Abdominopelvic
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Article information

rID: 53276
Section: Anatomy
Synonyms or Alternate Spellings:
  • Root of mesentery
  • Root of the small bowel mesentery
  • Root of small bowel mesentery
  • Root of the small intestine mesentery
  • Root of small intestine mesentery
  • Mesenteric root

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