Renal pyramid
Pyramis renalis
- Latin eponym: Pyramis Malphighii
- Eponym: Pyramids of Malphighi
- Related terms: Renal pyramids
Definition
The medullary substance (substantia medullaris) consists of a series of red-colored striated conical masses, termed the renal pyramids, the bases of which are directed toward the circumference of the kidney, while their apices converge toward the renal sinus, where they form prominent papillæ projecting into the interior of the calyces.