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* 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.
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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===