Question

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

Answer 1

Parturition:

Parturition is the expulsion of the fully developed foetus from the uterus after the completion of the gestation period.

Foetal ejection reflex:

Foetal ejection reflex refers to the signals for parturition that originate from the fully developed foetus and the placenta, which induces mild uterine contractions.


Process of foetal ejection reflex:

Fully developed foetus pushes down the birth canal, causing stretching of the cervix. This generates nerve impulse which stimulates the hypothalamus. It in turn causes the posterior pituitary to release oxytocin (birth hormone). Oxytocin causes the uterine muscles to contract more vigorously which leads to parturition.