Macroscopic Features of the Delivered Placenta

  • Kurt Benirschke
  • Peter Kaufmann


The full-term, delivered placenta is, in more than 90% of the cases, a disk-like, flat, round to oval organ. In nearly 10% it has abnormal shapes, such as placenta bilobata, placenta duplex, placenta succenturiata, placenta zonaria, and placenta membranacea (Torpin, 1969). The average diameter is 22 cm, the average thickness in the center of the delivered organ 2.5 cm, and the average weight 470g (see Table 28.1). The respective measurements show considerable interindividual variation and strongly depend on such factors as the mode of birth, timing of cord clamping (see Table 28.8), and time elapsed between delivery and examination.


Human Placenta Villous Tree Intervillous Space Human Placental Lactogen Chorionic Plate 
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© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Kurt Benirschke
    • 1
  • Peter Kaufmann
    • 2
  1. 1.University Medical CenterUniversity of California, San DiegoSan DiegoUSA
  2. 2.Institut für Anatomie der Medizinischen FakultätRheinisch-Westfälische Technische Hochschule AachenAachenGermany

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