<prompt> Which aery dilatation causes compression of 3rd pa of duodenumSuperior mesenteric aeryGastroduodenal aeryInferior mesenteric aeryCeliac aery  <response>: 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 bw 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. 