Gross/Macroscopic Variations and Conditions

Fetal Membranes

Circummarginate placenta

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

Copyright: 2002-2022,, Inc.

PubMed Search: Circummarginate placenta

Mandolin S. Ziadie, M.D.
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Cite this page: Ziadie MS. Circummarginate placenta. website. Accessed December 1st, 2022.
Definition / general
  • Insertion of the membranes away from the placenta without a distinct ridge at the point of insertion
  • More common in multigravid pregnancies
Gross description
  • Like circumvallate placentas, the point of membrane insertion is inside the edge of the disc
  • However, no firm ridge at the site of insertion is present
  • Margin is thin and flat
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