This obstetrical wax model shows the end of the dilation of the uterine mouth, now totally flattened with no sign of the cervix. Dilation precedes the second stage of labor: the expulsion of the fetus. This wax model shows an engagement with cephalic presentation. The head is flexed, lowering the occiput to advance in the continuous canal formed by the cervix and vagina.

The model was commissioned by Felice Fontana, who was working on the installation of the Museo di Fisica e Storia Naturale of Florence, from the sculptor Giuseppe Ferrini and his assistant Clemente Susini.