Human development

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.


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