Cortical lobule
Encyclopedia
A cortical lobule is a part of a renal lobe
Renal lobe
The renal lobe is a portion of a kidney consisting of a renal pyramid and the renal cortex above it. It is visible without a microscope, though it is easier to see in humans than in other animals....

. It consists of the nephrons grouped around a single medullary ray
Medullary ray (anatomy)
In anatomy, the medullary ray is the middle part of the cortical lobule or renal lobule, consisting of a group of straight tubes to the collecting ducts.Their name is potentially misleading -- the "medullary" refers to their destination, not their location...

, and draining into a single collecting duct.
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