This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small intestine and large intestine, Subject name: Anatomy
Which aery dilatation causes compression of 3rd pa of duodenum 
Select and explain. 
A. Superior mesenteric aery, B. Gastroduodenal aery, C. Inferior mesenteric aery, D. Celiac aery
A: Superior mesenteric aery
Answer: A: Superior mesenteric aery 
Explanation: Superior mesenteric aery: - Aery of mid gut Origin - L1 veebrae level . Regional anatomy of SMA: - It is crossed anteriorly by the splenic vein & the neck of pancreas. Posterior to it is the renal vein, the uncinate process & the inferior pa of duodenum (3rd pa). - This D3 pa can be compressed b/w two aeries: - Anterior - SMA Posterior - Abdominal aoa SMA dilatation can lead to compression of 3rd pa of duodenum. | This is called as superior Mesenteric aery syndrome.