Question

Identify artery 'X' in the given angiography anatomy image.

• A. Superior mesenteric artery
• B. Subclavian artery
• C. Celiac artery
• D. Brachiocephalic artery

Hint:

Which anterior aortic branch at L1 supplies the midgut and sends out the small-bowel arterial arcade?

Answer 1

The Correct Option is A

Step 1: The marked vessel is the superior mesenteric artery (SMA), a major abdominal artery that arises from the abdominal aorta and supplies the midgut, which runs from the major duodenal papilla of the duodenum to the proximal two-thirds of the transverse colon.
Step 2: On angiography the SMA is recognised by its origin and course. It is the second of the three major anterior branches of the abdominal aorta, arising anteriorly at the level of the L1 vertebra, just below the coeliac trunk, then descending over the posterior abdomen and fanning out into jejunal, ileal and colic branches.
Step 3: Key relations confirm it: the left renal vein and the uncinate process of the pancreas lie posterior, while the splenic vein and neck of the pancreas lie anterior. The uncinate process is the only part of the pancreas that hooks behind the SMA.
Step 4: Why the distractors are wrong: the subclavian and brachiocephalic arteries are thoracic vessels of the aortic arch supplying the upper limb and head, not the gut. The coeliac artery is the first anterior aortic branch with a short trunk dividing into left gastric, splenic and common hepatic arteries, a different branching pattern. The arborising midgut supply identifies 'X' as the SMA.