Explanation

Foetal ejection reflex is an accelerated active labor and birth which is induced by release of oxytocin from pituitary. Oxytocin (child birth hormone), secreted by neurohypophysis of pituitary gland, stimulates contraction of uterus muscles, including labour pain for child birth, when secretion of progesterone hormone declines, making the end of pregnancy. As the sensory impulse of increasing labor pain reaches hypothalamus, more and more oxytocin is released from posterior pituitary under a positive feedback regulation.