Paper - An analysis of the age and size of 483 human embryos

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Skidmore FD. An Analysis of the Age and Size of 483 Human Embryos. (1976) Teratology 15: 97-102. PMID 557243

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An Analysis of the Age and Size of 483 Human Embryos

Skidmore F.D.

Carnegie Collection


The crown-rump length of 483 fixed human embryos of Carnegie stages6-23 was analyzed and median and predicted mean lengths were calculated. The results were compared with those of other series and confirmed that early human growth rates are different from those of macaques with which human embryo growth has previously been compared. The study indicated that it is possible to predict:

  1. the median size of an embryo of given Streeter horizon or Carnegie stage
  2. the age of a fresh embryo, or one of undisputed Streeter staging, by comparison with mean figures of other authorities
  3. the corrected age of an embryo of known length or known Streeter staging or both in terms of post-ovulation age.

Since teratogens may reduce the embryonic growth rate this information is relevant in the analysis of teratogenic factors in human development.

Cite this page: Hill, M.A. (2024, June 23) Embryology Paper - An analysis of the age and size of 483 human embryos. Retrieved from

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