Consider the following statements regarding the root of the mesentry: It is 30 cm long Extends from the duodenojejunal flexure to right sacroiliac joint. Left ureter and psoas major are crossed by the root of the mesentry Superior mesentric aery and vein are its contents

**Core Concept**
The root of the mesentery is a vital anatomical structure that attaches the small intestine to the back of the abdominal wall. It is a fan-shaped fold of peritoneum, containing vessels, nerves, and lymphatics. The **mesenteric root** plays a crucial role in supporting the small intestine.

**Why the Correct Answer is Right**
The root of the mesentery indeed extends from the **duodenojejunal flexure** to the **right sacroiliac joint**, covering a distance of approximately 15 cm, not 30 cm, but its contents and relations are accurately described. The **superior mesenteric artery** and **vein** are key contents of the mesenteric root. The root crosses over the **right ureter** and **psoas major**, among other structures.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect due to the inaccurate length.
**Option B:** Not provided for analysis.
**Option C:** Not provided for analysis.

**Clinical Pearl / High-Yield Fact**
The root of the mesentery is a critical anatomical landmark, and its relationship with surrounding structures is essential for surgical and diagnostic procedures. Remembering that the **superior mesenteric artery** arises from the aorta behind the neck of the pancreas and passes over the **third part of the duodenum** is crucial.

**Correct Answer:** D.

✓ Correct Answer: C. Statements 1 and 3 are false