**Question:** All of the following arteries supply the first 2 cm of the duodenum, EXCEPT:

A. Superior mesenteric artery (SMA)
B. Proximal part of the pancreaticoduodenal arcade
C. Proximal part of the gastroduodenal artery
D. Proximal part of the left gastric artery

**Correct Answer: D. Proximal part of the left gastric artery**

**Core Concept:**

The duodenum is the first part of the small intestine, and its blood supply is primarily derived from the celiac trunk and its branches. The celiac trunk is a major arterial trunk that arises from the abdominal aorta and gives rise to three major branches:

1. Superior mesenteric artery (SMA): This artery supplies the superior (head and neck) part of the duodenum.
2. Proximal part of the pancreaticoduodenal arcade: This artery supplies the head and neck portion of the pancreas as well as the first part of the duodenum.
3. Proximal part of the gastroduodenal artery: This artery supplies the head of the pancreas and the first part of the duodenum.
4. Proximal part of the left gastric artery: This artery supplies the left gastric artery and the lesser curvature of the stomach, not the duodenum.

**Why the Correct Answer is Right:**

The arteries supplying the first 2 cm of the duodenum are the superior mesenteric artery (SMA), the proximal part of the pancreaticoduodenal arcade, and the proximal part of the gastroduodenal artery.

**Why Each Wrong Option is Incorrect:**

A. The superior mesenteric artery (SMA) supplies the superior part of the duodenum (not the first 2 cm).
B. The proximal part of the pancreaticoduodenal arcade supplies the head and neck portion of the pancreas and the first part of the duodenum.
C. The proximal part of the gastroduodenal artery supplies the head of the pancreas and the first part of the duodenum.
D. The proximal part of the left gastric artery supplies the lesser curvature of the stomach, not the duodenum.

**Clinical Pearls:**

1. Understanding the arterial supply to the duodenum is crucial in understanding gastrointestinal anatomy and its surgical implications. For example, during a Whipple's procedure (pancreaticoduodenectomy), preserving the superior mesenteric artery and its branches is essential to maintain blood supply to the duodenum.
2. In clinical practice, knowledge of the arterial supply to the duodenum is essential for surgeons, gastroenterologists, and radiologists when interpreting arterial angiograms, as well as for gastroenterologists when evaluating patients with gastrointestinal bleeding.

In summary, the correct answer is D due to the proximal part of the left gastric artery supplying the lesser curvature of the stomach, not the duodenum. The other options supply the duodenum, which is crucial to know for gastro