Renal Artery

Description

Arising from the abdominal aorta, the renal artery courses laterally toward the medial border of the male kidney and enters at the renal hilum, where it lies posterior to the renal vein and anterior to the renal pelvis in typical anatomy. A sectional plane through the organ reveals the renal cortex as an outer rim and the renal medulla as striated pyramids whose papillae project into the minor calyces. Within the renal sinus, the calyces converge into the renal pelvis, which continues inferiorly as the ureter, while arterial branches subdivide toward segmental and interlobar distributions between the pyramids. Renal arterial anatomy is the operative map for nephron-sparing surgery and renal transplantation, since segmental arteries behave as end arteries and inadvertent ligation can infarct a discrete wedge of parenchyma. This cut also supports teaching of corticomedullary perfusion: cortical branches feed glomeruli, while deeper flow tracks toward the juxtamedullary region, a key concept when discussing ischemic acute tubular injury and papillary necrosis. Small accessory renal arteries, when present, often enter the kidney outside the hilum and can be missed without a clear mental model of hilar relationships. Use this illustration in gross anatomy and renal physiology courses to tie macroscopic landmarks (cortex, pyramids, calyces, renal pelvis) to arterial branching and urine outflow pathways. It also fits urology and vascular surgery materials covering partial nephrectomy planning, hilar clamping, and interpretation of CT angiography or Doppler findings in renal artery stenosis. Anatomical accuracy verified by SciePro's Medical Advisory Board.