Abstrakt
In the drawing of coitus by Leonardo da Vinci are pictured the contemporary hypotheses regarding this act. The authors analyse the mamillar-uteral connection depicted by the artist and grow up to believe that this is a hypothetical kiveris vena, female vein described by anatomist Master Nicolai Physicus from Salerno school.
The Hebrew roots were found in the name. The connection is described also by Mondino in the Anathomia.
The same connection can be found in the picture of the pregnant in Fasciculus Medicinæ by Johannes De Ketham.