Carnegie Institution of Washington

Carnegie Stages

<a href="/search?text=Carnegie%20Stages" title="" class="lexicon-term">Carnegie Stages</a>

Historically the exact age of human embryo specimens has long perplexed embryologists. With the menstrual history of the mother often unknown or not exact, and the premenstrual and postmenstrual phases varying considerably among women, age sometimes came down to a best guess based on the weight and size of the embryo.

Carnegie Institution of Washington Department of Embryology

<a href="/search?text=Carnegie%20Institution%20of%20Washington" title="" class="lexicon-term">Carnegie Institution of Washington</a> Department of Embryology

The Carnegie Institution of Washington’s (CIW) Embryology Department was opened in 1914 and remains one of six departments in the CIW. The department quickly became, and remains, world renown for its many embryonic development discoveries. In 1913

Elizabeth Maplesden Ramsey (1906-1993)

Elizabeth Maplesden Ramsey

Physician and pathologist Elizabeth Maplesden Ramsey was a member of the Carnegie Institution of Washington (CIW) for thirty-nine years. The affiliation began in 1934, when Ramsey discovered what was assumed to be the youngest-known embryo at the time, and donated it to CIW’s massive embryo collection. After studying embryos, Ramsey focused her research on placental circulation in primates.

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