HISTOLOGY OF KIDNEY. Dr Iram Tassaduq. GENERAL ORGANIZATION OF RENAL STRUCTURE. Capsule Cortex • C ortical labryinth • M edullary rays Medulla • renal pyramids • cortical/renal columns Renal pelvis Major and minor calyxes. LOBES AND LOBULES.
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Dr Iram Tassaduq
• Cortical labryinth
• Medullary rays
• renal pyramids
• cortical/renal columns
Major and minor calyxes
Each kidney lobe consists of a medullary pyramid and its associated cortex.
A renal lobule is defined as a portion of the kidney containing thoseNephrons that are served by a common collecting duct.
The thin segment of Henle's loop leads into the straight part of the distal tubule, which is formed by low cuboidal cells without a brush border. A few short microvilli are present
Epithelial cells in the ascending parts of the intermediate and straight distal tubules cells transport chloride (active) and sodium ions (passive) out of the tubular lumen into the surrounding peritubular space.
The epithelium can not be penetrated by water. Consequently, the transport of ions over the epithelium sets up a gradient in osmotic pressure, which serves as driving force in the further concentration of the urine.
Present in medullary ray
Lined by simple cuboidal epithelium
Transport urine from nephron to renal pelvis