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Placenta

Umbilical cord

Embryonic remnants


Reviewers: Mandolin Ziadie, M.D. (see Reviewers page)
Revised: 13 November 2011, last major update November 2011
Copyright: (c) 2003-2011, PathologyOutlines.com, Inc.

Definition
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● Remnants of the allantoic duct (outpouching of the yolk sac) and omphalomesenteric duct (originally connecting the small bowel with the yolk sac) may be found in the term placenta
● They may be accompanied by embryonic vessels
● No clinical significance

Micro description
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● Allantoic duct remnants: located centrally between the umbilical arteries; lined by flat / cuboidal cells
● Omphalomesenteric remnants: located peripherally and lined by columnar epithelium; may have a muscular wall and may be accompanied by vessels
● Both are usually at fetal end of the umbilical cord (Hum Pathol 1989;20:458)

End of Placenta > Umbilical cord > Embryonic remnants


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