what is the name of the outer region of the kidney deep to the renal capsule
1 Cortex â the outer region of the kidney; extensions of the cortical tissue, contains about one million blood filtering nephrons. 2  Nephron â these are the filtration units in the kidneys. 3  Medulla â inner region of the kidney contains 8-12 renal pyramids.4  The pyramids empty into the calyx. Cortex â the outer region of the kidney; extensions of the cortical tissue, contains about one million blood filtering nephrons. 2  Nephron â these are the filtration units in the kidneys. 3  Medulla â inner region of the kidney contains 8-12 renal pyramids.