kidney,renal,organ,ureter,anatomy,body,nephrology,cross-section,cross section,section,cut,layers,cortex,medulla,medullary,cortical,nephron,juxtamedullary,juxtamedullary nephron,cortical nephron,blood vessels,vessels,blood supply,functional unit,artery,vein,arteriole,venule,capillary,renal corpuscle,bowman's capsule,glomerulus,loop of henle,convoluted tubule,descending limb of loop of henle,ascending limb of loop of henle,proximal convoluted tubule,collection duct,PCT,DCT