1) Kidney anatomy 
the conical masses constituting the medulla of the kidney, the base toward the cortex and culminating at the summit in the renal papilla.
Type: Term Definitions: 1. pyramidal masses seen on longitudinal section of the kidney; collectively, they constitute the renal medullae and contain part of the secreting tubules and the collecting tubules. Synonyms: pyramides renales, malpighian pyramid, medullary pyramid, pyramis renalis
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.