The hormones oxytocin and vasopressin are actually synthesised by the:

Step-by-step solution

Oxytocin and vasopressin are stored and released by the neurohypophysis (pars nervosa or posterior pituitary). However, these hormones are actually synthesised by the hypothalamus. They are transported axonally from the hypothalamus to the neurohypophysis. Therefore, pars nervosa is the site of storage and release, not synthesis. Pars distalis and pars intermedia are parts of the adenohypophysis which synthesise their own hormones. Answer: Hypothalamus