Distribution of SNGFR in the cortex
Juxta-medullary nephrons are consistently found to have higher filtration rates than superficial nephrons. Is this due to the underlying anatomy of the cortical radial artery, from which the juxta-medullary afferent arterioles branch before the superficial arterioles? Is it due to anatomical differences in the glomeruli, such as length, surface area or permeability? Or is it perhaps a matter of differences in the regulation of glomerular blood flow?