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juxtamedullary nephron
A juxtamedullary nephron is a type of nephron, found only in birds and mammals. ''Medullary'' refers to the renal medulla, while the ''juxta'' (Latin: near) refers to the relative position of the renal corpuscle, which in these nephrons is ''near the medulla'' (but still in cortex. junction) . In other words, a ''juxtamedullary nephron'' is one where the renal corpuscle is close to the medulla, and the proximal convoluted tubule and its associated loop of Henle occur at a deep position compared to most other nephrons.
This type of nephron is relatively rare, and only comprise 20–30% of the nephrons in the human kidney. However, in most depictions of the nephron, it is a juxtamedullary nephron which is depicted. The greater gradient in the deep medulla make this type of nephron do more "work" than more shallow nephrons, and their vertical nature makes them easier to illustrate. It is these nephrons which are responsible for the development of the osmotic gradients in the renal medulla, which are used to concentrate urine.These nephrons have a long loop of henle than cortical type of nephrons. Also the hairpin bend penetrates up to the inner zone of medulla
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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