Kidney non-tumor - Tubules and interstitium

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Kidney non-tumor

Tubules and interstitium

Reviewers: Nikhil Sangle, M.D. (see Reviewers page)
Revised: 11 April 2012, last major update April 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.

General
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● Juxtaglomerular apparatus: close to glomerulus where afferent arteriole enters it; consists of juxtaglomerular cells (modified smooth muscle cells) plus macula densa (region of distal tubule as it returns to vascular pole of parent glomeruli) plus lacis or Goormaghtigh cells (nongranular cells that reside near afferent arteriole, macula densa and glomerulus and resemble mesangial cells); produces renin; cells of macula densa show reverse polarity (with abluminal nuclei and basal cytoplasmic clearing due to Golgi apparatus) to direct the synthesized molecules towards the glomerulus
● Interstitium: contains fibroblast like cells and peritubular capillaries; expands due to edema and inflammation
● Medullary rays: in cortex, contain cortical collecting tubules and loops of Henle of superficial nephrons
● Proximal tubules: long microvilli, numerous mitochondria and extensive intercellular interdigitations assist in reabsorption of sodium, water, proteins, glucose, potassium, phosphate and amino acids; vulnerable to toxins and ischemic damage
● Renal columns of Bertin: cortical tissue extending into spaces between pyramids

Diagrams / Gross images
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Juxtaglomerular apparatus

Renal column

Vessels supplying tubule

Vessels surrounding glomeruli and tubules

Micro images
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Collecting duct: brush border

Juxtaglomerular apparatus and macula densa

Medullary rays

Cytology images
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Glomeruli (1A), tubules (1B)

End of Kidney non-tumor > Tubules and interstitium

Ref Updated: 4/6/12

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