Untrue about 3rd part of duodenum is –
**Core Concept**
The 3rd part of the duodenum is a significant anatomical structure, being the third and final portion of the duodenum, which is the first part of the small intestine. It is **retroperitoneal** and contains the superior mesenteric vessels. The duodenum plays a crucial role in the digestion and absorption of nutrients.
**Why the Correct Answer is Right**
Since the question is incomplete, let's focus on general knowledge about the 3rd part of the duodenum. It is crossed anteriorly by the superior mesenteric vessels and the root of the mesentery. The 3rd part of the duodenum is also where the **superior mesenteric artery** and vein are located, which supply the small intestine.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot determine why it's incorrect.
**Option B:** Similarly, without the details, the reasoning cannot be provided.
**Option C:** Same as above.
**Option D:** Same as above.
**Clinical Pearl / High-Yield Fact**
The 3rd part of the duodenum is a common site for **duodenal obstruction** due to external compression by the superior mesenteric artery, known as superior mesenteric artery syndrome.
**Correct Answer:** Not provided due to incomplete question.