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Human embryos of the first month of pregnancy

@MKU

Plaster models of Ziegler waxes, showing human embryos of the first month of pregnancy. By Friedrich Ziegler after Wilhelm His, 1885. 4 models D2 (known as M after physician-donor Miescher from Basel) is model 4 from Ziegler series 1, and magnifies 40 times D3 (known as R after unknown Russian physician-donor) is model 7 from Ziegler series 1 and magnifies 20 times D4 (known as A after physician-donor Ahlfeld from Leipzig) is model 8 from Ziegler series 1 and magnifies 20 times D1 is of a later developmental stage and does not feature in Ziegler Series 1, as the rest of the models do.

Nineteenth century