Root of the mesentery
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 ileocaecal junction in the right iliac fossa.
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.
The mesenteric root is contiguous
- superiorly: hepatoduodenal ligament
- anteriorly: right side of the transverse mesocolon; the gastrocolic trunk marks the border between them
- posterolaterally: ascending and descending mesocolon; the inferior mesenteric vein (IMV) is a landmark of the latter
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- 2. Susan Standring. Gray's Anatomy. ISBN: 9780443066849
- 3. Mcminn. Last's Anatomy. ISBN: 9780729537520