[[Image:Aspinall Slide14.JPG|thumb|right|250px|<small>Image from [http://www.elsevierhealth.co.uk/veterinary-nursing/spe-60136/ Aspinall, The Complete Textbook of Veterinary Nursing], Elsevier Health Sciences, ''All rights reserved''</small>]]
* Contains medullary pyramids
* Contains medullary pyramids
* 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