Event that take place in the uterus and birth canal to expel the viable fetus through the vagina.
The onset is painful, regular contractions, more than one every ten minutes
with progressive cervical effacement and dilatation
accompanied by descent of the head of fetus .
T he expulsion of a viable fetus out of the uterus .
NORMAL LABOUR (EUTOCIA)
Labour is consider normal when mature fetus presenting by vertex
delivers by natural efforts
without prolongation of labour.
A difficult labour, which refers to a labour not progressing satisfactorily with possible undue consequences to mother and fetus.
Primary force – actions of the uterine muscles Secondary force – involuntary contraction of muscles of diaphragm and anterior abdominal wall (bearing down effort) Formed by the soft tissues covering the bony pelvis through which the fetus is expelled during labour *pelvic inlet *pelvic cavity *pelvic outlet POWER PASSAGE PASSENGER