This terracotta teaching 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. The fetal membranes are ruptured and the fetus, engaging in a vertex presentation, is about to descend into the pelvic cavity. The head is still high and mobile on the superior strait. The wax model XVIII.15 describes the same situation at a slightly later point in labor. The model was commissioned by Giuseppe Galletti.