Renal Artery

Description

Sectioned through the kidney in an anterior-oriented plane, the cut surface exposes the renal cortex peripherally and the medulla centrally, with multiple renal pyramids tapering toward the papillae. Medial to the pyramids, the calyces converge into the renal pelvis, forming the funnel that continues as the proximal ureter. Along the renal hilum, the renal artery enters medial to the renal parenchyma and is rendered in longitudinal and cross-section, with a thick tunica media relative to its lumen; smaller intrarenal branches track toward the corticomedullary junction as segmental and interlobar vessels. Clear cortical to medullary stratification. Wall morphology matters here because the renal artery is a high-flow, high-pressure conduit, and its smooth muscle investment underpins autoregulation of renal perfusion, a central concept when teaching juxtaglomerular apparatus signaling and renin release. Pathology localizes to this anatomy: atherosclerotic renal artery stenosis typically affects the ostium and proximal segment, while fibromuscular dysplasia favors the mid to distal artery, both producing renovascular hypertension and ischemic nephropathy. Interventional planning also depends on recognizing where intrarenal branching becomes segmental, since embolization or endovascular stenting must preserve perfusion to discrete renal territories. Use this illustration in renal anatomy and histology blocks to link gross renal architecture (cortex, pyramids, calyces, renal pelvis) with vascular organization, and in nephrology or vascular surgery materials discussing renal artery stenosis, renal infarction patterns, or transplant hilar anastomoses. It also fits radiology teaching for correlating CT angiography or Doppler findings with the expected course and caliber changes of the renal artery and its branches. Anatomical accuracy verified by SciePro's Medical Advisory Board.