The renal column is a medullary extension of the renal cortex in between the renal pyramids. It allows the cortex to be better anchored. Each column consists of lines of blood vessels and urinary tubes and a fibrous material. , Renal pyramids , Renal papilla , Renal medulla , , - "Posterior Abdominal Wall: Internal Structure of a Kidney" , , - "Urinary System: neonatal kidney" ,