[Atlas of the stages of development of the nervous system in the intact human embryo].

Many features of the developing nervous system are visible in the intact human embryo, and a photographic atlas from 3-7 postovulatory weeks (stages 10-19) is provided. A number of features, such as the cerebellar plate, the cerebral vesicles, and the epiphysis cerebri, can be detected on external views at as early a stage as they have previously been recorded after microscopical examination. After 7 weeks it becomes increasingly difficult to identify features of the brain from the surface.