This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
The mesentery of small intestine, along its attachment to the posterior abdominal wall, crosses all of the following structures except: 
Select and explain. 
A. Left gonadal vessels, B. Third pa of duodenum., C. Aoa, D. Right ureter.
A: Left gonadal vessels
Answer: A: Left gonadal vessels 
Explanation: A i.e. Left gonadal vesselsRoot of mesentery crosses (successively) te ascending (4th) and inferior horizontal (3rd) pas of duodenum, abdominal aoa, IVC, right ureter, right psoas major and right gonadal (testicular/ovarian) vesselQ. It does not cross left ureter, leftgonadal vessels and superior mesenteric vessels.