Abstract
It has been documented that a pistomatic phenomenon is permanently applied during childbirth, that the head is intimate contact with soft birth paths, both structures acting on each other. Pressures in their interactions, anemize soft parts, ruptures of the perineum, vagina, cervix, intestine occur.
The pressure of the birth canal changes the head configuration such as dolichocephaly, caput succedaneum, external and internal kefalhematoma, rpt tentoria, claviculus fractures, humerus, Brachial plexus At the beginning of the 18th century, the concept that the fetus itself was involved in active labor was abandoned. The significance and character of uterine contractions, which are decisive for the realization of spontaneous delivery, have been recognized..
In the birth mechanism, the birth object is distinguished - the fetus, the birth canal - the hard and the soft and the birth forces - the uterine contraction and the abdominal press, a classification that could not have arisen before the Galilean and Newtonian laws of mechanics were established.