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Specimens from early human embryonic development largely originate from chance findings in material collected for pathological analysis following spontaneous or induced abortions, and minimally invasive gynecological surgery for termination of pregnancy (suction curettage) emerging in the early 1990s has now made it almost impossible to procure new intact specimens. Although the absolute number of specimens collected world-wide may be quite high due to the intrinsic fascination held by human embryos, few concerted long-term projects have managed to organise the complex and labour-intensive logistics of acquiring, processing and safely storing specimens for morphological (i.e. histological) analysis. As a result, only four centres world-wide house collections with an appreciable number of scientifically useful specimens.

Presenting Human Embryology in an International Open-Access Reference Centre (HERC)