What is foetal ejection reflex? Explain how it leads to parturition?

Explanation

Foetal ejection reflex is a neuroendocrine mechanism initiated by fully formed foetus and placenta which helps in parturition. It operates as below: Foetus secretes hormones from its adrenal glands. These hormone stimulate the posterior pituitary of the mother to release oxytocin. Oxytocin causes forceful contraction of smooth muscles of myometrium called labour pains, which further stimulates more secretion of oxytocin. The stimulatory reflex between uterine contraction and oxytocin secretion continues which causes more forceful contraction of uterine muscles. Uterine contractions pushes the young gradually out through the dilated cervix (caused by relaxin) and vagina.