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The renal capsule is supplied by capillary branches of the '''interlobular arteries'''.  Venous drainage of the capsule is provided by the '''stellate veins''', which subsequently drain into the '''interlobular veins'''.
 
The renal capsule is supplied by capillary branches of the '''interlobular arteries'''.  Venous drainage of the capsule is provided by the '''stellate veins''', which subsequently drain into the '''interlobular veins'''.
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The '''vasa recta''' form a series of straight capillaries that lie parallel to the loop of Henle within the renal medulla. The vasa recta branch off the efferent arterioles of juxtamedullary nephrons. Blood flow within the vasa recta is very slow, allowing the countercurrent exchange mechanism to occur within the loop of Henle by mainaining a meduallary concentration gradient.  The maintenance of this concentration gradient is one of the components responsible for the kidney's ability to produce concentrated urine.
    
===Innervation===
 
===Innervation===
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