22.9.10

Egg in Uterus


[...] De Conceptu et Generatione Hominis (1554), by Jacob Rueff, represents the continuation of the Aristotelian-Thomist view of the male seed causing the mother's blood to coagulate in the uterus,the Aristotelian theory of the male semen and the female blood coagulum in the uterus.

The uterus first appears to be filled with the menstrual blood upon which the semen progressively acts, building up the vessels and shaping the body's organs. After approximately forty or ninety days (male and female conceptus, respectively), the fœtus appears as formatus . [...] More details

Jacob Rueff (c. 1500-1558) was a surgeon and obstetrician in Zurich.
His treatise on human generation is first published in German in 1553 before being translated into latin in 1554 : ""De conceptu et generatione hominis et iis quae circa haec potissimum consyderantur libri sex", Tiguri : Fraschoverus, 1554.

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