A specific hormone is responsible for stimulating vigorous contraction of the uterus at the time of childbirth. Identify the anatomical site where this hormone is synthesised.

Step-by-step solution

The hormone responsible for stimulating vigorous contraction of the uterus at the time of childbirth is oxytocin. Although oxytocin is stored and released into the blood by the posterior pituitary (pars nervosa), it is actually synthesised by the hypothalamus and transported axonally to the neurohypophysis. Therefore, the correct site of synthesis is the hypothalamus. Answer: Hypothalamus