Presentation of fetal head irregular
When the bent head begins to straighten prematurely (at the beginning of childbirth or even during pregnancy) and in this state move along the birth canal, talk about extensor presentation of the voice. There are 3 degrees of it. 1 tbsp., Pre-head presentation - the head passes through the birth canal by the region of the large fontanel. II art., Frontal presentation - the fetus passes through the birth canal with the forehead, lower than the rest of the head. IIl art., Facial presentation - the head is bent so sharply that the chin of the fetus becomes the leading point. The biomechanism of childbirth at all degrees is similar, they are characterized by a protracted nature and significantly increased injuries of the mother and fetus.