This teaching model describes a breech birth, in which the upper limbs form a barrier to the expulsion of a fetus in anterior position. This adverse occurrence was caused by one or more abrupt tractions on the feet by the operator. The arms undergo attrition against the uterine walls and the pelvic entrance. They therefore depart from their normal attitude in front of the thorax and do not engage with the trunk of the fetus, which is moving out of the womb. The model was commissioned by Giuseppe Galletti.