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Development of the facial regions of early human embryos

@MKS-b

Ziegler wax models showing the development of the face, which tends to be obscured by the curvature of whole embryos, first made in the 1850s under the direction of Alexander Ecker This is a series of 4 models of which we have all 4. Model 1: Carnegie stage 13 (approx. 28 post-ovulatory days). Corresponds to model 1 of @MKS-a Model 2: Carnegie stage 15/16 (approx. 35 post-ovulatory days) Model 3: Carnegie stage 17 (approx. 41 post-ovulatory days). Corresponds to model 2 of @MKS-a Model 4: Carnegie stage 20-23 (approx. 53 post-ovulatory days). Corresponds to model 4 of @MKS-a Model 1 magnifies 20 times, models 2-4 magnify 11 times.

Nineteenth century