Histology Of KIDNEY
The kidney is a compound tubular gland. Structurally it is composed of stroma and parenchyma.
Stroma of kidney is formed by collagenous capsule and Interstitial C.T. The interstitial c.t! is formed of few collagen fibers and many reticular fibers. Each kidney is formed of about 18 lobes, each of which consists of many lobules, which are demarcated by Interlobular arteries.
In vertical section, the parenchyma of kidney shows
(I)an outer granular zone (cortex) and
(II) an inner striated zone (medulla).
The cortex appears brown-red granular because it contains spherical bodies (the renal corpuscles or Malplghlan bodies) and convoluted parts of renal tubules.
The medulla (light-gray in color) gives a striated appearance because it lodges parallel-arranged blood vessels and straight parts of renal tubules, which run towards pelvis of the kidney in a radiating manner.
Some cortical substances extend into certain regions of medulla as renal columns of Bertln while medullary material extends into the cortex as medullary rays.
The medullary substance of each kidney is arranged as 8-18 conical masses called pyramids.
Base of each pyramid lies adjacent to the cortex, while the apex known as papilla projecting into minor calyx of the renal pelvis. Each pyramid with its overlying cortex is called as lobe of the kidney. Each pyramid contains 400-500 medullary rays (collecting tubules). 5-7 pyramids open into one minor calyx. There are 9-10 minor calyces, which open into 2-3 major calyces. These lead to a single pelvis.
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