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A tough outer capsule surrounds the parenchyma and this prevents the kidney expanding.
 
A tough outer capsule surrounds the parenchyma and this prevents the kidney expanding.
 
====Renal Cortex====
 
====Renal Cortex====
The renal cortex is comprised of two parts: the external zone and internal zone (juxtomedullar).
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The renal cortex is the outermost layer of parenchyma, it lies just beneath the renal capsule. The renal cortex is comprised of two parts. The cortex contains the following parts of the [[:Category:Nephron| nephron]]
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*[[Nephron Microscopic Anatomy #The Renal Corpuscle| Renal corpuscle]]
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*[[Nephron Microscopic Anatomy #Proximal Tubule| Proximal convoluted tubule]]
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*[[Nephron Microscopic Anatomy #The Distal Tubule| Distal convoluted tubule]]
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*[[WikiWords#Urinary Section| Medullary Rays]]
 
====Renal Medulla====
 
====Renal Medulla====
 
The renal medulla contains medullary pyramids.  The part nearest the cortex is the base of the pyramid which narrows to form the inner part; the renal papilla. The medulla can be split into two parts, the outer and the inner. Different parts of the [[:Category:Nephron| nephron]] reside in these areas
 
The renal medulla contains medullary pyramids.  The part nearest the cortex is the base of the pyramid which narrows to form the inner part; the renal papilla. The medulla can be split into two parts, the outer and the inner. Different parts of the [[:Category:Nephron| nephron]] reside in these areas
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