Placenta
Umbilical cord
Supernumerary vessels


Topic Completed: 1 November 2011

Revised: 20 February 2019

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Supernumerary vessels umbilical

Mandolin S. Ziadie, M.D.
Page views in 2018: 222
Page views in 2019 to date: 185
Cite this page: Ziadie MS. Supernumerary vessels. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/placentasupernumerary.html. Accessed September 18th, 2019.
Definition / general
  • Four or more umbilical cord vessels due to an extra artery or vein
  • May be associated with fetal anomalies and maternal smoking
  • Thought to originate from persistent umbilical veins or vitelline vessels
Gross description
  • Looping may cause artifactual supernumerary vessels and should be excluded on gross examination
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