the rat hypothalamus ( containing the supra-optic nuclei , paraventricular nuclei , median eminence and proximal pituitary stalk ) has been incubated in vitro and shown to be capable of releasing the neurohypophysial hormones , oxytocin and arginine vasopressin , at a steady basal rate about one twentieth that of the rat neural lobe superfused in vitro .
C0032017
neurohypophysial hormones
C0030095
oxytocin