Kidney nontumor

Topic Completed: 1 March 2012

Minor changes: 1 October 2019

Copyright: 2002-2019,, Inc.

PubMed search: Embryology[title] kidney

Nikhil Sangle, M.D.
Page views in 2019: 356
Page views in 2020 to date: 174
Cite this page: Sangle N. Embryology. website. Accessed August 7th, 2020.
Definition / general
  • Metanephric blastema: forms glomerulus, proximal convoluted tubules, loops of Henle, distal convoluted tubules and connective tissue of renal interstitium
  • Ureteric bud: forms cortical and medullary collecting tubules and medullary collecting ducts

  • Stages of kidney development:
    • Pronephros (based on Wolffian duct, kidneys non-functional)
    • Mesonephros (appear at week 4, form nephron-like tubules but degenerate)
    • Metanephros (form at week 5, function by week 11)
Gross images

Images hosted on other servers:

Fetal kidneys at 25 weeks gestation

Infant kidney with fetal lobulations

Microscopic (histologic) images

Contributed by Dr. Grigory Demyashkin, I. M. Sechenov First Moscow State Medical University (Russia): 6 - 8 week embryo

Left: metanephros; right: adrenal gland medulla

Left, above: metanephros; center: colon; right from top: pancreas

Left: small intestine; bottom:
stomach; center: gonad and kidney
primary (mesonephros);
right: symphysis

Final kidney (metanephros), renal corpuscle

Final kidney (metanephros), renal corpuscle, collecting ducts

Left: metanephros; right: adrenal gland medulla

Final kidney (metanephros)

Left, above: final kidney (metanephros);
lower left: liver; center: gonad &
kidney primary (mesonephros); right:

Final kidney (metanephros)

Center: adrenal gland, medulla & final kidney (metanephros)

Additional references
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