Gross/Macroscopic Variations and Conditions

Umbilical cord

Velamentous insertion

Last author update: 1 November 2011
Last staff update: 28 October 2020

Copyright: 2002-2022,, Inc.

PubMed Search: Velamentous insertion[title] umbilical cord

Mandolin S. Ziadie, M.D.
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Cite this page: Ziadie MS. Velamentous insertion. website. Accessed December 9th, 2022.
Definition / general
  • Insertion of umbilical cord into extraplacental membranes, with intramembranous portions of vessels exposed to possible trauma / rupture
  • Occurs in 1% of placentas
  • Associated with twin gestations, congenital malformations, maternal smoking and single umbilical arteries
  • Poses a risk for vascular compression, trauma and thrombosis with associated risks of fetal morbidity and mortality
Gross images

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Velamentous insertion of umbilical cord

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