Step-by-step explanation:
The triangular regions of the kidneys that are striped in appearance and separated by the renal columns are called renal pyramids. They are also known as medullary pyramids or Malpighian pyramids. These structures are located within the renal medulla, the innermost part of the kidney. The renal pyramids contain the collecting ducts and loops of Henle, which play a crucial role in the concentration and transportation of urine. The striped appearance is due to the presence of parallel bundles of tiny tubules and blood vessels, giving them a striated or striped appearance.