单词	renal pyramid
释义	renal pyramid noun anatomy : any of the somewhat triangular- or wedge-shaped masses of tissue of the inner medulla (see medulla sense 2a) region of the kidney that project as the renal papillae into the renal pelvis, and have a striated appearance due to the presence of collecting tubules and collecting ducts Word History First Known Use 1861, in the meaning defined above Medical Definition renal pyramid noun : any of the somewhat triangular- or wedge-shaped masses of tissue of the inner medulla region of the kidney that project as the renal papillae into the renal pelvis, and have a striated appearance due to the presence of collecting tubules and collecting ducts called also Malpighian pyramid
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