Renal cortex is outer granulated layer that dips down between the renal medulla. Renal medulla has radially striated cone-shaped masses called renal pyramids . Renal pelvis is central space or cavity continuous with ureter. Nephrons a. Nephrons are microscopic, sometimes called renal or kidney tubules. Each kidney contains over one million nephrons.
Several nephrons enter one collecting duct.
Anatomy of a Nephron Blood Flow Through Nephron a. Renal artery brings blood in. Afferent arteriole leads to glomerulus, a tuft of capillaries. This first capillary region is inside glomerular capsule. Efferent arteriole leaves glomerulus.