Which of the following structures passes posterior to the hilum of the kidney?

Explanation

## Vascular and Ureteric Relations at the Renal Hilum ### Anatomical Arrangement at the Hilum **Key Point:** At the renal hilum, the structures are arranged in a specific anteroposterior sequence: the renal vein is anterior, the renal artery is in the middle, and the ureter is posterior. ### Mnemonic for Hilum Arrangement **Mnemonic:** VAU = Vein Anterior, Artery (middle), Ureter (posterior). This describes the anteroposterior relationship of the three main structures at the renal hilum. ### Detailed Anatomical Relationships | Structure | Position at Hilum | Relationship | | --- | --- | --- | | Renal vein | Anterior | Most anterior of the three main structures | | Renal artery | Middle | Lies between the vein and ureter | | Ureter | Posterior | Most posterior; lies behind the renal vessels | | Renal nerve plexus | Surrounds hilum | Distributed around the hilum, not specifically posterior | **High-Yield:** The posterior position of the ureter at the renal hilum is clinically important during renal surgery to avoid ureteric injury. The ureter's posterior location makes it vulnerable during anterior surgical approaches. **Clinical Pearl:** During nephrectomy, the surgeon must be aware that the ureter lies posterior to the renal vessels. Inadvertent ligation or division of the ureter can occur if the posterior dissection is not performed carefully. ### Why This Arrangement Matters 1. The renal vein is anterior because it drains blood from the kidney 2. The renal artery is middle, supplying the kidney 3. The ureter is posterior, exiting the kidney to descend toward the bladder This arrangement is consistent across both kidneys and is a fundamental anatomical principle.