Human development

Dandy-Walker Syndrome

Dandy-Walker Syndrome

Dandy-Walker Syndrome

Editor's note: Madeleine Howell-Moroney created the above image for this article. You can find the full image and all relevant information here.

Meiosis in Humans

<a href="/search?text=Meiosis%20in%20Humans" title="" class="lexicon-term">Meiosis in Humans</a>

Meiosis

Editor's note: Katherine Koczwara created the above image for this article. You can find the full image and all relevant information here.

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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