Changes

* External zone

* External zone

* Internal zone (juxtamedullar)

* Internal zone (juxtamedullar)

* Contains the following parts of the [[The Nephron - Anatomy & Physiology| nephron]]

* Contains the following parts of the [[:Category:Nephron| nephron]]

** [[Nephron Microscopic Anatomy #The Renal Corpuscle| Renal corpuscle]]

** [[Nephron Microscopic Anatomy #The Renal Corpuscle| Renal corpuscle]]

** [[Nephron Microscopic Anatomy #Proximal Tubule| Proximal convoluted tubule]]

** [[Nephron Microscopic Anatomy #Proximal Tubule| Proximal convoluted tubule]]

* The part nearest the cortex is the base of the pyramid which narrows to form the inner part - renal papilla

* The part nearest the cortex is the base of the pyramid which narrows to form the inner part - renal papilla

* The medulla can be split into two parts, the outer and the inner

* The medulla can be split into two parts, the outer and the inner

* Different parts of the [[The Nephron - Anatomy & Physiology| nephron]] reside in these areas

* Different parts of the [[:Category:Nephron| nephron]] reside in these areas

====Outer Medulla====

====Outer Medulla====

The outer medulla can be further divided into the outer and inner stripe

The outer medulla can be further divided into the outer and inner stripe

=====The Outer Stripe=====

=====The Outer Stripe=====

This section located just inside the cortex contains the following parts of the [[The Nephron - Anatomy & Physiology| nephron]]:

This section located just inside the cortex contains the following parts of the [[:Category:Nephron| nephron]]:

* [[Nephron Microscopic Anatomy #Proximal Tubule| Proximal straight tubules]]

* [[Nephron Microscopic Anatomy #Proximal Tubule| Proximal straight tubules]]

* [[Nephron Microscopic Anatomy #The Distal Tubule| Distal straight tubules]]

* [[Nephron Microscopic Anatomy #The Distal Tubule| Distal straight tubules]]

* Renal Pyramids are important descriptor of part of the kidney.

* Renal Pyramids are important descriptor of part of the kidney.

**These structures are visible grossly and 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 and 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 [[WikiWords#Urinary Section| renal lobules]] comprising of [[The Nephron - Anatomy & Physiology| nephrons]], [[WikiWords#Urinary Section| a medullary ray]] and [[Nephron Microscopic Anatomy #Collecting Duct| a collecting duct]].

* They can also be subdivided into [[WikiWords#Urinary Section| renal lobules]] comprising of [[:Category:Nephron| nephrons]], [[WikiWords#Urinary Section| a medullary ray]] and [[Nephron Microscopic Anatomy #Collecting Duct| a collecting duct]].

* 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.

* 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.