PMID: 7018270Jul 1, 1981Paper

Structural organization of the renal medulla: comparative and functional aspects

The American Journal of Physiology
W Kriz

Abstract

The renal medulla develops very differently among species, being more prominent in those with a high urinary concentrating capacity. Attempts to correlate structure and function must consider loops of Henle, collecting ducts, vessels, interstitium, and pelvis. Two types of loops of Henle, long and short, are distinguished. Numerical relationships between both differ among species. Based on the epithelial lining a short loop consists of a thick descending limb (pars recta of proximal tubule), a thin descending limb, and a thick ascending limb. Long loops, in addition, have a thin ascending limb; their descending thin limbs are different from those of short loops and are site of considerable interspecies differences. Collecting ducts form in the cortex by joining several nephrons. Patterns with and without arcade formation are distinguished. On entering inner medulla, collecting ducts fuse successively. Collecting duct epithelium consists of principal and intercalated cells whose individual functions are subject to debate. Blood vessels are arranged in a very strict pattern reflecting that, in addition to nourishment, unique requirements in maintaining the corticomedullary osmotic gradient are to be met. Ultrastructural organizat...Continue Reading

Citations

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