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The renal cortex is the outer portion of the kidney between the renal capsule and the renal medulla. [1] In the adult, it forms a continuous smooth outer zone with a number of projections ( cortical columns ) that extend down between the pyramids .
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The renal columns, Bertin columns, or columns of Bertin, a.k.a. columns of Bertini are extensions of the renal cortex in between the renal pyramids. They allow the cortex to be better anchored. (Cortical extensions into the medullary space.) Each column consists of lines of blood vessels and urinary tubes and a fibrous material.
Each nephron is located in both the cortex and the medulla. The most proximal part of the nephron is glomerulus, which is located in the cortex. [28] The nephrons of the mammalian kidneys have loops of Henle, which are the most efficient way to reabsorb water and produce concentrated urine to conserve water in the body. [12]
The human urinary system, also known as the urinary tract or renal system, consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate waste from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites , and regulate blood pH .
The renal lobe is a portion of a kidney consisting of a renal pyramid and the renal cortex above it. [1] In humans, on average there are 7 to 18 renal lobes. [medical citation needed] It is visible without a microscope, though it is easier to see in humans than in other animals.
Urinary excretion rate = Filtration rate – Reabsorption rate + Secretion rate [1] Although the strictest sense of the word excretion with respect to the urinary system is urination itself, renal clearance is also conventionally called excretion (for example, in the set term fractional excretion of sodium).
renal cortex; renal capsule; adipose capsule of kidney (or perirenal fat, or perinephric fat) renal fascia; pararenal fat; peritoneum (anteriorly), and transverse fascia (posteriorly). Sometimes the adipose capsule of the kidney also known as the perirenal fat, is regarded as a part of the renal capsule. [4]