The calyces are the recesses in the internal medulla of the kidney which enclose the renal pyramids. They are used to subdivide the sections of the kidney anatomically, with distinction being made between major calyces and minor calyces. Research Calyces
The renal pyramids are conical segments within the internal medulla of the kidney. The renal pyramids contain the secreting apparatus and tubules and are also known as the malphighian pyramids. Research Renal Pyramids
 
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