<P> Renal pyramids ( or malpighian pyramids or Malpighi 's pyramids named after Marcello Malpighi , a seventeenth - century anatomist ) are cone - shaped tissues of the kidney . In humans , the renal medulla is made up of 10 to 18 of these conical subdivisions . The broad base of each pyramid faces the renal cortex , and its apex , or papilla , points internally towards the pelvis . The pyramids appear striped because they are formed by straight parallel segments of nephrons and collecting ducts . The base of each pyramid originates at the corticomedullary border and the apex terminates in a papilla , which lies within a minor calyx , made of parallel bundles of urine collecting tubules . </P>
<P> Renal pyramids ( or malpighian pyramids or Malpighi 's pyramids named after Marcello Malpighi , a seventeenth - century anatomist ) are cone - shaped tissues of the kidney . In humans , the renal medulla is made up of 10 to 18 of these conical subdivisions . The broad base of each pyramid faces the renal cortex , and its apex , or papilla , points internally towards the pelvis . The pyramids appear striped because they are formed by straight parallel segments of nephrons and collecting ducts . The base of each pyramid originates at the corticomedullary border and the apex terminates in a papilla , which lies within a minor calyx , made of parallel bundles of urine collecting tubules . </P>
why do renal pyramids have a striped appearance
why do renal pyramids have a striped appearance
because they are formed by straight parallel segments of nephrons and collecting ducts
because they are formed by straight parallel segments of nephrons and collecting ducts