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**These structures are visible grossly are the region of the medulla which appears triangular in cross section. They are actually cone shaped and the pointed part which faces towards the renal pelvis is termed the apex and the part against the cortex the base.
 
**These structures are visible grossly are the region of the medulla which appears triangular in cross section. They are actually cone shaped and the pointed part which faces towards the renal pelvis is termed the apex and the part against the cortex the base.
 
* They can also be subdivided into [[Useful definitions - Renal Anatomy & Physiology#R| renal lobules]] comprising of [[The Nephron - Anatomy & Physiology| nephrons]], [[Useful definitions - Renal Anatomy & Physiology | a medullary ray]] and [[Microscopic Anatomy of the Nephron - Anatomy & Physiology#Collecting Duct| a collecting duct]].
 
* They can also be subdivided into [[Useful definitions - Renal Anatomy & Physiology#R| renal lobules]] comprising of [[The Nephron - Anatomy & Physiology| nephrons]], [[Useful definitions - Renal Anatomy & Physiology | a medullary ray]] and [[Microscopic Anatomy of the Nephron - Anatomy & Physiology#Collecting Duct| a collecting duct]].
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* In some species the kidneys are described as multipyramidal this means they have multiple lobes and pyramids.  Others are described as unipyramidal meaning they only have one lobe and pyramid.
    
===Innervation===
 
===Innervation===
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