Placental Shape Aberrations

  • Rebecca N. Baergen


Round or oval placentas are the predominant human placental form but many other shapes exist (Fig. 13.1). When the placenta is irregular, its shape is presumably determined by location, atrophy, and ­perhaps the manner of original implantation. Anomalies may develop from abnormal­ fetal genes expressed by the placenta, an abnormal maternal environment, or an abnormal fetal-maternal interaction. Interestingly, for each aberrant placental shape in humans, there is a counterpart in animals. Thus, the placenta membranacea is similar to the normally diffuse placenta in equines; the zonary placenta is typical of carnivores and so on.


Placenta Previa Placenta Accreta Accessory Lobe Fetal Vessel Villous Tissue 
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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Rebecca N. Baergen
    • 1
  1. 1.New York Presbyterian Hospital—Weill Medical College of Cornell UniversityNew YorkUSA

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