[3] The PVN is thought to mediate many diverse functions through different hormones, including osmoregulation, appetite, wakefulness, and the response of the body to stress.

These hormones are packaged into large vesicles, which are then transported down the unmyelinated axons of the cells and released from neurosecretory nerve terminals residing in the posterior pituitary gland.

[citation needed] Similar magnocellular neurons are found in the supraoptic nucleus which also secrete vasopressin and a smaller amount of oxytocin.

The centrally-projecting neurons include The PVN receives afferent inputs from many brain regions and different parts of the body, by hormonal control.

Inputs from glucose sensors within the brain stimulate release of vasopressin and corticotropin-releasing hormone from parvocellular neurosecretory cells.